Why Only One Side of Tinfoil Is Shiny

The shiny side is on top here, but that doesn't necessarily make it better.
The shiny side is on top here, but that doesn't necessarily make it better.
Marco Verch Professional Photographer, Flickr // CC BY 2.0

The decision to give tinfoil two different sides—one shiny, one dull—wasn’t made with professional chefs or recreational bakers in mind. In fact, it’s mostly an inconsequential result of the manufacturing process.

To create tinfoil (or aluminum foil, to be precise), a massive slab of aluminum is repeatedly fed through heated steel rollers until it’s just 5 millimeters thick. At that point, it’s moved to a set of cold rollers for further thinning. But as CulinaryLore.com explains, it’s already thin enough to break during that stage, so manufacturers push through two sheets at a time. When the top of the top sheet and the bottom of the bottom sheet rub against the rollers, they get shiny. Since the bottom of the top sheet and the top of the bottom sheet only touch each other, they stay dull.

Because the shiny side seems more reflective, many people think that side should face up while cooking or baking. And if you’re using a DIY solar oven (or trying to fry an egg outside on a hot day), that makes sense: More sunlight will reflect off the shiny surface, which will transfer more heat to your meal. But most regular ovens heat food through a process called convection, where the air in your oven circulates heat energy from the hot areas (e.g. coils) to the cold ones (your food). In other words, convection ovens don’t care how reflective their contents are.

That said, the shiny-versus-dull discrepancy does matter when it comes to certain special types of aluminum foil. The dull side of Reynolds Non-Stick Aluminum Foil, for example, is coated with a substance that will help keep your food from sticking to it—so you should definitely place your food on that side. As TODAY points out, the dull side of that particular product is printed with the term non-stick so you don’t forget.

Aluminum foil also isn’t just for ovens. From sharpening scissors to scrubbing grills, here are 15 other ways to use your roll.

[h/t CulinaryLore.com]

10 Reusable Gifts for Your Eco-Friendliest Friend

Disposable tea bags can't compete with this pla-tea-pus and his friends.
Disposable tea bags can't compete with this pla-tea-pus and his friends.
DecorChic/Amazon

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links.

By this point, your eco-friendly pal probably has a reusable water bottle that accompanies them everywhere and some sturdy grocery totes that keep their plastic-bag count below par. Here are 10 other sustainable gift ideas that’ll help them in their conservation efforts.

1. Reusable Produce Bags; $13

No more staticky plastic bags.Naturally Sensible/Amazon

The complimentary plastic produce bags in grocery stores aren’t great, but neither is having all your spherical fruits and vegetables roll pell-mell down the checkout conveyor belt. Enter the perfect alternative: mesh bags that are nylon, lightweight, and even machine-washable.

Buy it: Amazon

2. Animal Tea Infusers; $16

Nothing like afternoon tea with your tiny animal friends.DecorChic/Amazon

Saying goodbye to disposable tea bags calls for a quality tea diffuser, and there’s really no reason why it shouldn’t be shaped like an adorable animal. This “ParTEA Pack” includes a hippo, platypus, otter, cat, and owl, which can all hang over the edge of a glass or mug. (In other words, you won’t have to fish them out with your fingers or dirty a spoon when your loose leaf is done steeping.)

Buy it: Amazon

3. Rocketbook Smart Notebook; $25

Typing your notes on a tablet or laptop might save trees, but it doesn’t quite capture the feeling of writing on paper with a regular pen. The Rocketbook, on the other hand, does. After you’re finished filling a page with sketches, musings, or whatever else, you scan it into the Rocketbook app with your smartphone, wipe it clean with the microfiber cloth, and start again. This one also comes with a compatible pen, but any PILOT FriXion pens will do.

Buy it: Amazon

4. Food Huggers; $13

"I'm a hugger!"Food Huggers/Amazon

It’s hard to compete with the convenience of plastic wrap or tin foil when it comes to covering the exposed end of a piece of produce or an open tin can—and keeping those leftovers in food storage containers can take up valuable space in the fridge. This set of five silicone Food Huggers stretch to fit over a wide range of circular goods, from a lidless jar to half a lemon.

Buy it: Amazon

5. Swiffer Mop Pads; $15

For floors that'll shine like the top of the Chrysler Building.Turbo Microfiber/Amazon

Swiffers may be much less unwieldy than regular mops, but the disposable pads present a problem to anyone who likes to keep their trash output to a minimum. These machine-washable pads fasten to the bottom of any Swiffer WetJet, and the thick microfiber will trap dirt and dust instead of pushing it into corners. Each pad lasts for at least 100 uses, so you’d be saving your eco-friendly friend quite a bit of money, too.

Buy it: Amazon

6. SodaStream for Sparkling Water; $69

A fondness for fizzy over flat water doesn’t have to mean buying it bottled. Not only does the SodaStream let you make seltzer at home, but it’s also small enough that it won’t take up too much precious counter space. SodaStream also sells flavor drops to give your home-brewed beverage even more flair—this pack from Amazon ($25) includes mango, orange, raspberry, lemon, and lime.

Buy it: Amazon

7. Washable Lint Roller; $13

Roller dirty.iLifeTech/Amazon

There’s a good chance that anyone with a pet (or just an intense dislike for lint) has lint-rolled their way through countless sticky sheets. iLifeTech’s reusable roller boasts “the power of glue,” which doesn’t wear off even after you’ve washed it. Each one also comes with a 3-inch travel-sized version, so you can stay fuzz-free on the go.

Buy it: Amazon

8. Countertop Compost Bin; $23

Like a tiny Tin Man for your table.Epica/Amazon

Even if you keep a compost pile in your own backyard, it doesn’t make sense to dash outside every time you need to dump a food scrap. A countertop compost bin can come in handy, especially if it kills odors and blends in with your decor. This 1.3-gallon pail does both. It’s made of stainless steel—which matches just about everything—and contains an activated-charcoal filter that prevents rancid peels and juices from stinking up your kitchen.

Buy it: Amazon

9. Fabric-Softening Dryer Balls; $17

Also great for learning how to juggle without breaking anything.Smart Sheep

Nobody likes starchy, scratchy clothes, but some people might like blowing through bottles of fabric softener and boxes of dryer sheets even less. Smart Sheep is here to offer a solution: wool dryer balls. Not only do they last for more than 1000 loads, they also dry your laundry faster. And since they don’t contain any chemicals, fragrances, or synthetic materials, they’re a doubly great option for people with allergies and/or sensitive skin.

Buy it: Amazon

10. Rechargeable Batteries; $40

Say goodbye to loose batteries in your junk drawer.eneloop/Amazon

While plenty of devices are rechargeable themselves, others still require batteries to buzz, whir, and change the TV channel—so it’s good to have some rechargeable batteries on hand. In addition to AA batteries, AAA batteries, and a charger, this case from Panasonic comes with tiny canisters that function as C and D batteries when you slip the smaller batteries into them.

Buy it: Amazon

Sign Up Today: Get exclusive deals, product news, reviews, and more with the Mental Floss Smart Shopping newsletter!

Why We Eat What We Eat on Thanksgiving

Photo by Craig Adderley from Pexels
Photo by Craig Adderley from Pexels

When Americans sit down with their families for Thanksgiving dinner, most of them will probably gorge themselves on the same traditional Thanksgiving menu, with turkey, cranberry sauce, stuffing, and pumpkin pie taking up the most real estate on the plates. How did these dishes become the national "what you eat on Thanksgiving" options, though? Let's take a look at the history of Thanksgiving foods.

Why do we eat turkey on Thanksgiving?

It's not necessarily because the pilgrims did it. Turkey may not have been on the menu at the 1621 celebration by the Pilgrims of Plymouth that is considered the first Thanksgiving (though some historians and fans of Virginia's Berkeley Plantation might quibble with the "first" part). There were definitely wild turkeys in the Plymouth area, though, as colonist William Bradford noted in his book Of Plymouth Plantation.

However, the best existing account of the Pilgrims' harvest feast comes from colonist Edward Winslow, the primary author of Mourt's Relation: A Journal of the Pilgrims at Plymouth. Winslow's first-hand account of the first Thanksgiving included no explicit mention of turkey. He does, however, mention the Pilgrims gathering wild fowl for the meal, although that could just as likely have meant ducks or geese.

When it comes to why we eat turkey on Thanksgiving today, it helps to know a bit about the history of the holiday. While the idea of giving thanks and celebrating the harvest was popular in certain parts of the country, it was by no means an annual national holiday until the 19th century. Presidents would occasionally declare a Thanksgiving Day celebration, but the holiday hadn't completely caught on nationwide. Many of these early celebrations included turkey; Alexander Hamilton once remarked, "No citizen of the U.S. shall refrain from turkey on Thanksgiving Day."

When Bradford's journals were reprinted in 1856 after being lost for at least half a century, they found a receptive audience with advocates who wanted Thanksgiving turned into a national holiday. Since Bradford wrote of how the colonists had hunted wild turkeys during the autumn of 1621 and since turkey is a uniquely North American (and scrumptious) bird, it gained traction as the Thanksgiving meal of choice for Americans after Lincoln declared Thanksgiving a national holiday in 1863.

Moreover, there were pragmatic reasons for eating turkey rather than, say, chicken at a feast like Thanksgiving. The birds are large enough that they can feed a table full of hungry family members, and unlike chickens or cows, they don't serve an additional purpose like laying eggs or making milk. Unlike pork, turkey wasn't so common that it seemed like an unsuitable choice for a special occasion, either.

Did the pilgrims have cranberry sauce on Thanksgiving?

While the cranberries the Pilgrims needed were probably easy to come by, making cranberry sauce requires sugar. Sugar was a rare luxury at the time of the first Thanksgiving, so while revelers may have eaten cranberries, it's unlikely that the feast featured the tasty sauce. What's more, it's not even entirely clear that cranberry sauce had been invented yet. It's not until 1663 that visitors to the area started commenting on a sweet sauce made of boiled cranberries that accompanied meat.

There's the same problem with potatoes. Neither sweet potatoes nor white potatoes were available to the colonists in 1621, so the Pilgrims definitely didn't feast on everyone's favorite tubers.

Did the first Thanksgiving feature pumpkin pie?

It may be the flagship dessert at modern Thanksgiving dinners, but pumpkin pie didn't make an appearance at the first Thanksgiving. The Pilgrims probably lacked the butter and flour needed to make a pie crust, and it's not clear that they even had an oven in which they could have baked a pumpkin pie. That doesn't mean pumpkins weren't available for the meal, though; they were probably served after being baked in the coals of a fire or stewed. Pumpkin pie became a popular dish on 17th-century American tables, though, and it might have shown up for Thanksgiving as early as the 1623 celebration of the holiday.

This article originally appeared in 2008.