11 Secrets of Hollywood Science Advisors

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The work of a Hollywood science advisor can be hard to spot. Rather than shoving science in the audience’s faces, it’s their job to make the world of a movie or TV show feel believable, from the physics of fight scenes to the theories that characters scrawl on the blackboard.

Science advisors are usually regular scientists working in fields like physics, astronomy, and chemistry; the main thing that often sets them apart from their peers is a passion for film and TV. Whether they're meeting with actors, checking equations, or shaping plot points, here are some of the ways they contribute to your favorite pieces of pop culture.

1. Science advisors are usually volunteers.

Most of the Hollywood science advisors that Mental Floss spoke to were doing the work pro bono. Donna Nelson, a chemist at the University of Oklahoma, learned that Breaking Bad was looking for a science advisor while reading an interview with the show’s creator, Vince Gilligan. According to him, the series was in need of guidance from a real scientist, but there wasn’t enough room in the budget to hire one. So Nelson volunteered to lend her knowledge.

That was in Season 1, and over the next several years Breaking Bad exploded into a massive success. But even as the budget grew, Nelson never once accepted a paycheck for her advising work. “I was a volunteer from beginning to end,” she tells Mental Floss. “I was delighted to do it because my goal was to help the scientific community.”

The same usually holds true even when the advisors contributing their expertise to a high-budget Hollywood blockbuster. James Kakalios, a physicist at the University of Minnesota and science advisor on such films as Watchmen (2009) and The Amazing Spider-Man (2012), tells Mental Floss, “All the consulting that I've done has been volunteering.”

2. Geeking out gets them noticed.

Before she became advisor on the TV show 12 Monkeys, Sophia Gad-Nasr, an astroparticle physicist at UC Irvine, was just a regular viewer talking about the episodes on social media. "I really liked it and I tweeted about it, so the showrunner reached out to me and let me know they were in need of a science advisor," she says.

Meanwhile, Kakalios was a comic book fan who had literally written the book on the physics of superheroes before he was asked to work on the Watchmen movie. "[Warner Bros.] contacted me and said 'We're making a movie about a comic book. Have you ever heard of this graphic novel called Watchmen?' And if you're into comic books, it's like saying 'Have you ever heard of this movie called Citizen Kane'?" he says. "So when I was done vibrating like a gong, I said 'Yes, I've heard of Watchmen.'"

3. They're sworn to secrecy.

Sean Carroll, a theoretical physicist at the California Institute of Technology, did some consulting on the upcoming movie Avengers 4—the entire plot of which has been kept tightly under wraps. He says, “I know things about that I’m not allowed to tell anybody. And they do make sure that you understand that.”

For 12 Monkeys, Gad-Nasr was hired to help introduce the Hartle-Hawking state—physicists Stephen Hawking and James Hartle's theory that prior to the Big Bang there was only space and no time—into the show. Her work ended up being one of the biggest spoilers of the series. “[In 12 Monkeys] you keep getting hints about this 'red forest,' and that red forest was actually the Hartle-Hawking state I worked on. I had to sign an NDA.”

4. They need to be on-call 24/7.

Scientists who sign on to advise a TV show shouldn’t expect normal working hours. The makers of the show might reach out to them whenever a science question comes up during filming, which can be any time of day or night. While working on Breaking Bad, Nelson knew that being able to answer emails quickly was crucial. “I tried to put myself in [the filmmakers’] place and thought of them being on set, and you know they’re not going to hold up filming for a science advisor,” she says. “They’re very busy … so if they don’t get an answer it will be easy for them to write the science out.”

5. They sometimes meet directly with actors.

A science advisor mainly works with writers, producers, and directors, but occasionally they'll meet with members of the cast. While consulting on Watchmen, Kakalios chatted with actor Billy Crudup to help develop his character, Dr. Manhattan, who’s a nuclear physicist. "We were talking about [Dr. Manhattan's] attitudes of being cut-off from humanity and I was talking to him about how as a director of graduate studies I often saw students get overwhelmed by graduate school," he says. "They can kind of shut down but the one thing they focused on exclusively is their work—it's the one thing they have control over. Later on he said he thought that was helpful."

6. They help make fictional scientists feel human.

The makers of Breaking Bad often asked Nelson what a chemist might do in certain situations, from the words they use to the way they interact with their students and peers. One of her insights into the psychology of Walter White became a major plot point in the series. “They asked, ‘If there was a person who was working alongside another person and one man would go on to be a Nobel Prize winner and the other would go on to become a high school teacher, what is something that could happen to make them take different paths?’ And I said, ‘Is there a young woman involved? Have the successful one take the girlfriend away from the other one and that would devastate him.’ And that’s exactly what they did.”

7. If you want to spot a science advisor’s work, check the blackboard.

One of the most common tasks science advisors are given is something most viewers never notice. If a movie or TV show contains a scene with a professor (or scientist, mathematician, etc.) in front of a blackboard, it’s the science advisor's job to make sure that whatever equations are behind him or her make sense.

“I spent three days on the set of the TV show Bones because they had a long set of sequences with writing on blackboards,” Carroll says. The character writing on the chalkboard in that episode was also a theoretical physicist, and Carroll was responsible for making sure the work was accurate.

Gad-Nasr was also called to set to double-check the math she had come up with for 12 Monkeys. “It wasn’t me who wrote it on the blackboard, but I just came by to make sure everything was cool.”

A blackboard full of nonsense can also be a sign of a film or TV show that doesn’t have a science advisor. Before signing onto Breaking Bad, Nelson noticed some bogus equations on the board in Walter White’s classroom in early episodes. “There were parts that weren’t accurate and I would have stepped up and said something,” she says. But she was able to make up for it later on when the makers of the show asked her to draw some alkene structures to feature on a blackboard. “A person who’s not paying attention might not see that, but a student who’s just had alkene as an undergrad in class or as a high school student taking organic chemistry—they may feel great to be able to look at the correct structures and not see something different from what they learned in class.”

8. Their advice can lead to rewrites ...

Much of a science advisor’s work boils down to small changes in the dialogue, but occasionally their input leads to more significant cuts. When working on Thor (2011), Carroll advised against one scene that depicted a character pushing another off a disc-shaped planet. “The problem is there’s no gravitational pull to pull you off the edge of the planet,” he says. “So scientifically that doesn’t quite make sense.” (On a disc-shaped planet, gravity would actually be working to pull you back to the center.)

9. ... But they usually try to keep changes minimal.

A scientist and director may disagree over the intricacies of superhero physics, but at the end of the day, a science advisor trusts that the filmmaker knows what’s best for their movie. When looking over scripts, Nelson says she made it her mission to keep the dialogue as intact as possible. “The [writers] knew how to write a successful script and I didn’t, so the number one thing I did not do was rewrite the page. So if there’s an incorrect word that’s a three-syllable word that starts with P, I would try to correct the sentence by substituting a different three-syllable word that started with P, because they in their writing might have a certain cadence in the sentence or alliteration or something like that that other people might miss, and I would always try not to destroy any of that.”

10. Their suggestions don’t always make it in.

No matter how much a filmmaker appreciates a science advisor’s input, they rarely choose science over story. “Very few movies or TV shows in the science fiction world try to be 100 percent accurate,” Carroll says. "Really they’re trying to tell a good story more than anything else.”

Nelson experienced this first-hand when she was asked for her opinion on one of the most famous examples of inaccurate science in Breaking Bad: Walt’s blue meth. “Vince [Gilligan] came and asked me, ‘What do you think about making the meth blue?’” she recalls. “And I said I wouldn’t do it, because meth is not blue, it’s white. He said ‘Isn’t there any reason why it might be blue under some circumstances?’ I said no, it will always be white. And as you know, they went ahead and made it blue because it was necessary for them to have a trademark for his meth. It was a plot device.”

11. More filmmakers are using them.

When the makers of Breaking Bad first brought Nelson on as a science advisor in 2008, hiring her was a bit of an experiment. "When I first started working, I was told in so many words that there was a rumor in Hollywood that you couldn’t have a hit show with a science advisor," she says. Today, working with a scientist is standard even in movies and TV shows with minimal scientific themes. Part of the job's growing prevalence can be credited to the Science and Entertainment Exchange, a program that connects entertainment industry professionals to scientists.

Another explanation is that today's media consumers hold filmmakers to higher standards. "I think there’s an increasing sophistication among the audience and you can’t just have any old thing happen," Carroll says. "We live in a generation post Cosmos and Brief History of Time where there are a lot of moviegoers who are very smart about what is plausible, and they want their plots to make sense."

11 Behind-the-Scenes Secrets of TV Meteorologists

nicoletaionescu/iStock via Getty Images
nicoletaionescu/iStock via Getty Images

The first weather forecast to hit national network television was given in 1949 by legendary weatherman Clint Youle. To illustrate weather systems, Youle covered a paper map of the U.S. in plexiglass and drew on it with a marker. A lot has changed in the world of meteorology since then, but every day, millions of families invite their local weatherman or weatherwoman into their living room to hear the forecast. Here are a few things you might not know about being a TV meteorologist.

1. SOME PEOPLE JUST NEVER MASTER THE GREEN SCREEN.

 A meteorologist working in front of a green screen.
eldinhoid/iStock via Getty Images

On-camera meteorologists might look as if they’re standing in front of a moving weather map, but in reality, there’s nothing except a blank green wall behind them. Thanks to the wonders of special effects, a digital map can be superimposed onto the green screen for viewers at home. TV monitors situated just off-camera show the meteorologist what viewers at home are seeing, which is how he or she knows where to stand and point. It’s harder than it looks, and for some rookie meteorologists, the learning curve can be steep.

“Some people never learn it,” says Gary England, legendary weatherman and former chief meteorologist for Oklahoma’s KWTV (England was also the first person to use Doppler radar to warn viewers about incoming systems). “For some it comes easily, but I’ve seen people never get used to it.”

Stephanie Abrams, meteorologist and co-host of The Weather Channel’s AMHQ, credits her green screen skills to long hours spent playing Nintendo and tennis as a kid. “You’ve gotta have good hand-eye coordination,” she says.

2. THEY HAVE A STRICT DRESS CODE.

Green is out of the question for on-air meteorologists, unless they want to blend into the map, but the list of prohibited wardrobe items doesn’t stop there. “Distracting prints are a no-no,” Jennifer Myers, a Dallas-based meteorologist for Oncorwrites on Reddit. “Cleavage angers viewers over 40 something fierce, so we stay away from that. There's no length rule on skirts/dresses but if you wouldn't wear it to a family event, you probably shouldn't wear it on TV. Nothing reflective. Nothing that makes sound.”

Myers says she has enough dresses to go five weeks without having to wear a dress twice. But all the limitations can make it difficult to find work attire that’s fashionable, looks good on-screen, and affordable. This is especially true for women, which is why when they find a garment that works, word spreads quickly. For example, this dress, which sold for $23 on Amazon, was shared in a private Facebook group for female meteorologists and quickly sold out in every color but green.

3. BUT IT’S CASUAL BELOW THE KNEE.

Since their feet rarely appear on camera, some meteorologists take to wearing casual, comfortable footwear, especially on long days. For example, England told the New York Times that during storm season, he was often on his feet for 12 straight hours. So, “he wears Mizuno running shoes, which look ridiculous with his suit and tie but provide a bit of extra cushioning,” Sam Anderson writes.

And occasionally female meteorologists will strap their mic pack to their calves or thighs rather than the more unpleasant option of stuffing it into their waistband or strapping it onto their bra.

4. THERE ARE TRICKS TO STAYING WARM IN A SNOWSTORM.

“In the field when I’m covering snow storms, I go to any pharmacy and get those back patches people wear, those heat wraps, and stick them all over my body,” explains Abrams. “Then I put on a wet suit. When you’re out for as long as we are, that helps you stay dry. I have to be really hot when I go out for winter storms.”

5. THERE’S NO SCRIPT.

Your local TV weather forecaster is ad-libbing from start to finish. “Our scripts are the graphics we create,” says Jacob Wycoff, a meteorologist with Western Mass News. “Generally speaking we’re using the graphics to talk through our stories, but everything we say is ad-libbed. Sometimes you can fumble the words you want to say, and sometimes you may miss a beat, but I think what that allows you to do is have a little off-the-cuff moment, which I think the viewers enjoy.”

6. MOM’S THE AUDIENCE.

A retro image of a weatherwoman.
H. Armstrong Roberts/Retrofile/Getty Images

Part of a meteorologist’s job is to break down very complicated scientific terminology and phenomena into something the general public can not only stomach, but crave. “The trick is … to approach the weather as if you're telling a story: Who are the main actors? Where is the conflict? What happens next?” explains Bob Henson, a Weather Underground meteorologist. “Along the way, you have the opportunity to do a bit of teaching. Weathercasters are often the only scientists that a member of the public will encounter on a regular basis on TV.”

Wycoff’s method for keeping it simple is to pretend like he’s having a conversation with his mom. “I’d pretend like I was giving her the forecast,” he says. “If my mom could understand it, I felt confident the general audience could as well. Part of that is also not using completely science-y terms that go over your audience’s head.”

7. SOCIAL MEDIA HAS MADE THEIR JOBS MORE DIFFICULT.

Professional meteorologists spend a lot of time debunking bogus forecasts spreading like wildfire across Twitter. “We have a lot of social media meteorologists that don’t have necessarily the background or training to create great forecasts,” Wycoff says. “We have to educate our viewers that they should know the source they’re getting information from.”

“People think it’s as easy as reading a chart,” says Scott Sistek, a meteorologist and weather blogger for KOMO TV in Seattle. “A lot of armchair meteorologists at home can look at a chart and go ok, half an inch of rain. But we take the public front when it’s wrong.”

8. THEY MAKE LIFE-OR-DEATH DECISIONS.

People plan their lives around the weather forecast, and when a storm rolls in, locals look to their meteorologist for guidance on what to do. If he or she gets the path of a tornado wrong, or downplays its severity, people’s lives are in danger. “If you miss a severe weather forecast and someone’s out on the ball field and gets stuck, someone could get injured,” says Wycoff. “It is a great responsibility that we have.”

Conversely, England says when things get dangerous, some people are reluctant to listen to a forecaster’s advice because they don’t like being told what to do. He relies on a little bit of psychological maneuvering to get people to take cover. “You suggest, you don’t tell,” he says. “You issue instructions but in a way where they feel like they’re making up their own minds.”

9. DON’T BANK ON THOSE SEVEN-DAY FORECASTS.

A weatherman reporting during a storm.
pxhidalgo/iStock via Getty Images

“I would say that within three days, meteorologists are about 90 percent accurate,” Wycoff says. “Then at five days we’re at about 60 percent to 75 percent and then after seven days it becomes a bit more wishy-washy.”

10. THEY’RE FRENEMIES.

The competition for viewers is fierce, and local meteorologists are all rivals in the same race. “When you’re in TV, all meteorologists at other competitors are the enemy,” England says. “You’re not good friends with them. They try to steal the shoes off your children and food off your plate. If they get higher ratings, they get more money.”

11. THEY’RE TIRED OF HEARING THE SAME JOKE OVER AND OVER.

“There’s always the running joke: ‘I wish I could be paid a million dollars to be wrong 80 percent of the time,’” Sistek says. “I wanted to have a contest for who can come up with the best weatherman insult, because we need something new! Let’s get creative here.”

A version of this story originally ran in 2015.

13 Behind-the-Scenes Secrets of Movie and TV Extras

EvgeniyShkolenko/iStock via Getty Images
EvgeniyShkolenko/iStock via Getty Images

Background actors are the unsung heroes of television. Without them, most movie and TV scenes would be empty and unrealistic. But while we’re obsessed with movie stars, we never hear much about the people moving around behind them—because by design, we’re not supposed to pay them any attention. Here are a few insights on what it’s like to get paid to blend into the background.

1. Extras Are Not Professionals.

The chances of using background acting as a foray into stardom are pretty slim. “You’re not gonna get your big break as an extra,” says Claire Beaudreault, who has been an extra on shows including Orange Is The New Black, GIRLS, and Law & Order: SVU.

Most of the people you see in the background of a film or TV show have other jobs and are just doing extra work for fun. “I didn’t do it because I saw it as some backdoor into acting or anything,” says Jason Feifer, who was an extra in a scene of the 2004 film Jersey Girl. “But there are definitely people who do that.”

And there are always a few extras on set trying desperately to stay in front of the camera. “It’s a silent vie for control,” says Dillon Francis, a Los Angeles-based actor who was an extra on the movie Easy A back in 2010. “It was kind of interesting to watch. These guys would learn where the camera was going and redo their vector so they walked in front of it.” That’s a quick way to get a slap on the wrist from the director or a production assistant.

2. Extras Have to Do a Lot of Hurry-Up-and-Wait on Set.

Days on set can be excruciatingly long, sometimes lasting more than 15 hours and starting at odd times or ending at the crack of dawn. And a lot of that time is spent just sitting around waiting to be used in a scene, or repeating a single shot a dozen times. “There are days you get to set and you wait and wait and you never get used,” says Amy Rogers, a regular extra featured in TV shows including Homeland and Banshee, “or you work all day and the footage never gets used.”

Extras spend their down time in a designated “holding” area reading or playing card games. On the set of Easy A, which was set in a high school, extras had to wear backpacks stuffed with bubble wrap to make them seem full. “A fun way to distract yourself in downtime was to open up your backpack and pop bubbles,” Francis says.

3. What Looks Like Booze On Camera Isn't Actually Alcohol.

A glass of apple juice spritzer
stephanhartmann/iStock via Getty Images

While posing as party-goers in bar scenes, extras need something to fill their cups. But film sets are no place for drunk actors, so the props team uses a number of tricks to fool the camera, some less appetizing than others. Apple juice is a good substitute for beer, according to Beaudreault: “Or it’ll be seltzer with a little food coloring in it. There will be bottles that have been cleaned out and their labels removed and fake labels put on.”

“Vinegar is sometimes used to approximate the texture and viscosity of booze,” Rogers says. “You’ll stand there with a glass of vinegar for eight hours.” And because filming can be a long and mind-numbingly repetitive process, nobody has time to replace melting ice cubes, so they’ll use gelatin ice cubes. Or, for the ultimate cheat, plastic wrap can be put in a cup filled with water to resemble crushed ice, according to Gale Nemec, who teaches a workshop for background actors. (This approach also apparently makes for festive centerpieces.)

4. Smokers Get Paid More.

When actors smoke on set, they’re usually not sucking on real cigarettes. On Mad Men, for example, the actors smoked herbal cigarettes that didn’t contain nicotine or tar (which is great, considering Jon Hamm reportedly smoked 74 of them shooting the pilot alone).

Non-union extras usually get paid minimum hourly wage, but according to Rogers, they get a small pay increase if they’re asked to smoke in a scene. “They call that a ‘bump’ in the business,” she says. The same rule applies if your car is featured in a scene. “They want boring cars that will never be noticed on screen,” says Steve D’Avria, an extra in The Hunger Games and Homeland. “My 2003 Toyota Camry has been in more TV shows than I have. You get a whole $20 for it.”

5. Extras Have Been Wearing the Same Duds for Days ...

On a film or TV set, continuity is key. To create the illusion that a scene is happening in real-time, rather than over a series of hours or days, every little detail must remain the same in each shot and from every angle. Extras are meticulously examined for accidental inconsistencies in their wardrobes. “You’ve gotta wear the same clothes every day,” Rogers says. “The production assistant will take your picture for continuity to make sure you haven’t taken off a necklace or something. For the Homeland finale, I wore a pair of leggings and a raincoat for a solid week.”

6. ... And They Usually Have To Bring Their Own—The Blander, The Better.

Row of men's shirts in blue colors on hanger
Tatiana Dyuvbanova/iStock via Getty Images

Background actors are usually expected to bring their own clothes to set unless the production has a large wardrobe budget. And if you were to peek into the closet of a regular background actor, you’d see hangers upon hangers of gray and dark blue clothing items. Muted colors are preferred on set to make sure extras are as unremarkable as possible. Shirts can’t have any visible logos, and white clothes are discouraged because they “have a tendency to shine like a beacon on camera,” Francis says.

If you resemble one of the principal actors, you’re probably not going to get much camera time. “On Homeland, you’ll never see them place anyone near Claire Danes who has the same hair color as her,” Rogers says.

And pro tip: never look at the camera. “One guy in The Hunger Games kept staring at the camera and they finally just told him he had to sit down,” D’Avria says.

7. Wardrobes for Extras Get Recycled.

If an extra has to wear an elaborate costume, there’s a chance it’s been used before on another set. “One outfit I wore for Insurgent was worn on Pirates of the Caribbean,” says Dawn McHargue, who has also appeared in The Hunger Games, Iron Man 3, Nashville, and Necessary Roughness.

8. Extras Are Great Mimes.

Extras often need to make a scene appear alive and bustling while at the same time remaining totally silent on set so as not to interfere with the actors’ dialogue. This means pretending to conduct a conversation without actually making any noise, and every extra seems to have their own method. “I’m either pretending to flirt with someone or gossiping about something,” Beaudreault says. Also, dance scenes are often filmed in silence and the music is added in later.

While filming a crowd scene for the movie Jersey Girl, Feifer says he spent hours pretending to applaud and cheer. “They would do entire takes where the audience would go through the whole motion but we wouldn’t clap. We would fake clap but not actually get our hands to meet.”

9. For Actors, Seasons Are Irrelevant.

It’s amazing what a little fake snow can do to transform a summer day into a winter wonderland. “Sometimes when you’re shooting a winter scene, everyone is in heavy jackets and hats and gloves and it’s actually 100 degrees outside,” Nemec says. “You can gauge whether it’s actually cold or not if breath is coming out of the actor’s mouth. If not, it’s a good bet they’ve put snow on the ground and it’s hot as all get out and everyone is playing like it’s cold.”

For indoor scenes, air conditioning has to be turned off to eliminate background noise, which makes for a sweaty situation. Between takes, overheating extras strip their layers off to cool down.

10. The Movie Stars Are Off Limits for Extras ...

“As a general rule, don’t speak to them unless they speak with you first,” advises casting director Tona B. Dahlquist.

While filming on one movie, McHargue and her fellow extras were told to avoid looking the star in the eye. “They were very adamant that we were not to go near him or touch him or we would get kicked off set immediately,” she says.

But occasionally extras get a candid glimpse of a movie star’s true personality. For example, while filming The Hunger Games, D’Avria saw Jennifer Lawrence chilling at a card table munching on M&Ms, and watched Josh Hutcherson (who played Peeta) ride around set on a BMX bike.

On the flip side, Francis was the victim of one star's on-set meltdown. “She sees me standing there and she freaks out, saying something about how she’s had a rash of stalkers lately and I’m within a 50-foot perimeter,” he says. “She’s glaring at me from the tent and a PA runs over, moves me a few feet away and says ‘sorry’ and runs away again.”

11. ... And Social Media Is a Good Way for Extras to Get Blacklisted.

Young people taking photo with smartphone
YakobchukOlena/iStock via Getty Images

Phones aren’t allowed on set and photos are strictly forbidden. “While filming Insurgent, there was a girl who took a picture of the set and shared it,” McHargue says. “Lionsgate security came from California to Atlanta and they took her away. She will never work on a set again. She’s blacklisted.”

If you’re sneaky, you can swipe a harmless item from set as a keepsake. While filming The Hunger Games, D’Avria says there were signs in the bathroom that said, “Flush the toilet or you’ll be sent to the Hunger Games.” “I borrowed that sign as a souvenir,” he says.

12. The On-Set Catering Is Pretty Good.

Vats of catered food
kckate16/iStock via Getty Images

The quality of food on set varies depending on budget, but generally, extras eat some amazing grub brought in by professional caterers. “The food on Iron Man 3 was the best food I’ve ever had,” McHargue says. “We ate with the cast and crew and we had anything you could think of: the best steak, shrimp, lobster, and crab. The buffet table, you couldn’t see the end of it.”

The catch: You often don’t get to eat lunch until about 3 pm and dinner starts at 10 pm, according to D’Avria. Extras are advised to bring a few snacks to hold them over until feeding time.

13. Extras Can't Watch TV Like Regular People.

Once you know how a movie is filmed, it’s hard to watch it with fresh eyes. “I can’t watch TV anymore without looking at the background actors and seeing who’s doing it right and who’s doing it wrong,” Nemec says.

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