25 Things You Didn’t Know You Could Recycle

iStock.com/Orbon Alija
iStock.com/Orbon Alija

According to the EPA, Americans generate approximately 262 million tons of waste each year—and that amount keeps growing. In honor of Earth Day, which we'll celebrate on April 22, here are a few things you may have been throwing out that, with a little effort, you can actually recycle.

1. Dentures

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Grandpa's choppers may hold $25 worth of recyclable metals, including gold, silver, and palladium. The Japan Denture Recycling Association is known to collect false teeth, remove and recycle the metals, and discard the rest of the denture (which is illegal to reuse). The program has donated all of its earnings to UNICEF.

2. Holiday lights

Bundle of holiday string lights

Got burnt out holiday lights? The folks at HolidayLEDs.com will gladly take your old lights, shred them, and sort the remaining PVC, glass, and copper. Those raw materials are taken to another recycling center to be resurrected.

3. Sex toys

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The first step in recycling your toy is to send it to a specialty processing plant, where it's sterilized and sorted. There, all "mechanical devices" are salvaged, refurbished, and resold. Silicone and rubber toys, on the other hand, are "ground up, mixed with a binding agent, and remolded into new toys," according to the aptly titled website, Sex Toy Recycling. Metals, plastics, and other leftovers retire from the pleasure industry and are recycled into conventional products.

4. Hotel soap

Hotel bathroom counter with cups, shampoo, and soap

Not all hotels throw out that half-used soap you left in the shower: Some send it to Clean the World. There, soap is soaked in a sanitizing solution, treated to a steam bath, and then tested for infections. Once deemed safe, the soap is distributed to less fortunate people across the globe. So stop stealing soap from hotels—you may be stealing from charity.

5. Mattresses

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You don't need to dump your old box spring at the landfill. Because they're equipped with special saws, mattress recycling factories can separate the wood, metal, foam, and cloth. The metal springs are magnetically removed, the wood is chipped, and the cloth and foam are shredded and baled. In its future life, your saggy mattress could become a cute sundress or even wallpaper.

6. Cooking oil

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When you’re finished making French fries at home, it can be tempting to toss the spent frying oil down the drain. But you shouldn’t—nearly half of all sewer overflows are caused by fat and oil. There are a few curbside programs in the United States that accept used cooking oil, which may send the oil to a biodiesel plant that will transform it into fuel. To see if there’s a collection point near you, use this online tool.

7. Dirty diapers

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The average baby soils 6000 diapers before being potty trained—that's one ton of diapers rotting in a landfill per child. But not all poo-packages have to suffer this fate. The company Knowaste collects and recycles dirty diapers at hospitals, nursing facilities, and public restrooms. After sanitizing the diaper with a solution, they mechanically separate the "organic matter" from the diaper's plastic, which is compressed into pellets and recycled into roof shingles. Meanwhile, paper pulp in diapers grows up to become wallpaper and shoe soles.

8. CDs

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CDs are made of polycarbonate and won't decompose at a landfill. But if you send your discs to The CD Recycling Center, they'll shred them into a fine powder that will be later melted down into a plastic perfect for automotive and building materials—even pavement!

9. Shoes

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Send your beat-up sneaks to Nike Grind and you'll help build a running track. Nike's recycling facility rips apart worn shoes, separating the rubber, foam, and fabric. The rubber is melted down for running track surfaces, the foam is converted into tennis court cushioning, and the fabric is used to pad basketball court floorboards.

10. Animal poop

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Why turn animal poop into fertilizer, manure, or trash when you can make it into a greeting card? Or a bouquet of arficial flowers? The folks at Poopoo Paper do that, plus more—they can transform the poop of a wide variety of animals (cows, horses, elephants, and more) into cards, bookmarks, keychains, magnets, jewelry and more!

11. Trophies

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Is your room full of plastic bowling trophies from fifth grade? If the thrill of victory fades, you can recycle your old trophies at recycling centers like Lamb Awards. They'll break down your retired awards, melting them down or reusing them for new trophies.

12. Human fat (warning; illegal) 

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If it weren't for legal complications, America's obsession with cosmetic surgery could solve its energy problem. In 2008, a Beverly Hills plastic surgeon lost his job when police caught him fueling his car with a biofuel created from his patients' liposuctioned fat. (Convicting him wasn't hard, since he advertised the substance online as "lipodiesel.") That's not the first time fat has powered transportation: In 2007, conservationist Peter Bethune used 2.5 gallons of human fat to fuel his eco-boat, Earthrace.

13. Aluminum foil

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Foil is probably one of the most thrown away recyclable materials out there. (Americans throw away about 1.5 million tons of aluminum products every year, according to the EPA.) But foil is 100 percent aluminum, and as long as you thoroughly clean it of any food waste, you technically should be able to recycle it with your aluminum cans (but first check with your local recycling plant to ensure they’re equipped to process it; some aren’t).

14. Crayons

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Don't toss those stubby Crayolas! Instead, mail them to the National Crayon Recycle Program, which takes unloved, broken crayons to a better place: They're melted in a vat of wax, remade, and resold. So far, the program has saved more than 120,000 pounds of crayons.

15. Dead pets

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When Fluffy bites the dust in Germany, you can memorialize your beloved pet by recycling her. In Germany, it's illegal to bury pets in public places. This leaves some pet owners in a bind when their furry friends die. A rendering plant near the town of Neustadt an der Weinstraße accepts deceased pets; animal fat is recycled into glycerin, which is used in cosmetics such as lip balm.

16. Shingles

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The EPA estimates that 11 million tons of shingles are disposed each year [PDF]. Most of them are made out of asphalt, which is why more than two dozen states pulverize the old shingles and recycle them into pavement. For every ton of shingles recycled, we save one barrel of oil.

17. Prescription drugs

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You can—and should—properly dispose of expired prescription drugs. But what about unneeded pills that are still good? Some states let you donate unused drugs back to pharmacies. Some charities also accept leftover HIV medicine from Americans who have switched prescriptions, stopped medicating, or passed away. These drugs are shipped overseas and distributed to HIV victims around the world.

18. Fishing line

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Fishing line is made from monofilament, a non-biodegradable plastic that you can't put in your everyday recycling bin. At Berkley Fishing, old fishing line is mixed with other recyclables (like milk cartons and plastic bottles) and transformed into fish-friendly habitats. So far, Berkley has saved and recycled more than 9 million miles of fishing line.

19. Wine corks

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Your recycling center probably doesn't accept wine corks, but companies like Terracycle and Yemm & Hart will. They turn cork into flat sheets of tile, which you can use for flooring, walls, and veneer. Another company, ReCORK, has extended the life of over 4 million unloved corks by giving them to SOLE, a Canadian sandal maker.

20. Pantyhose

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Most pantyhose are made of nylon, a recyclable thermoplastic that takes more than 40 years to decompose. Companies like No Nonsense save your old stockings by grinding them down and transforming them into park benches, playground equipment, carpets, and even toys.

21. Toothbrushes

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If you buy a plastic toothbrush from Preserve (which makes its toothbrushes from old Stonyfield Farms yogurt cups and other everyday items), it will take back your used toothbrush and give it a new life—this time as a piece of plastic lumber!

22. Tennis balls

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The company reBounces doesn’t really recycle tennis balls, it resurrects them. If you’ve got at least 200 balls sitting around, the company will send you a prepaid shipping label to help get the box on the road and repressurize the balls.

23. Yoga mats

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Most yoga mats are made from PVC, the same material in plumbing pipes, heavy-duty tarps, and rain boots. While many local yoga studios will accept well-loved mats and find them a new home, the company Sanuk has an appropriately squishy vision for each mat’s future: It will transform your old yoga mat into flip flops.

24. Defunct currency

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All governments have a way of dealing with old, worn money. (In 2016, the Indian government shredded old bills and turned them into hardboard.) But what about currency that is no longer legal tender? It turns out you can donate your old French francs, Spanish pesetas, or Dutch guilders to Parkinsons UK, who will recycle the old coins and banknotes.

25. Pet fur

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All of the pet fur on your sweaters, your couches, and your carpet could help save the ocean from oil spills. Hair is excellent at sopping up oil from the environment (hairball booms were used to soak up oil from the 2010 BP Oil Spill), so non-profit organizations such as the San Francisco-based Matter of Trust will accept pet fur to make oil-absorbing mats of Fido's fuzz.

This piece was updated for 2019.

Turn Your LEGO Bricks Into a Drone With the Flybrix Drone Kit

Flyxbrix/FatBrain
Flyxbrix/FatBrain

Now more than ever, it’s important to have a good hobby. Of course, a lot of people—maybe even you—have been obsessed with learning TikTok dances and baking sourdough bread for the last few months, but those hobbies can wear out their welcome pretty fast. So if you or someone you love is looking for something that’s a little more intellectually stimulating, you need to check out the Flybrix LEGO drone kit from Fat Brain Toys.

What is a Flybrix LEGO Drone Kit?

The Flybrix drone kit lets you build your own drones out of LEGO bricks and fly them around your house using your smartphone as a remote control (via Bluetooth). The kit itself comes with absolutely everything you need to start flying almost immediately, including a bag of 56-plus LEGO bricks, a LEGO figure pilot, eight quick-connect motors, eight propellers, a propeller wrench, a pre-programmed Flybrix flight board PCB, a USB data cord, a LiPo battery, and a USB LiPo battery charger. All you’ll have to do is download the Flybrix Configuration Software, the Bluetooth Flight Control App, and access online instructions and tutorials.

Experiment with your own designs.

The Flybrix LEGO drone kit is specifically designed to promote exploration and experimentation. All the components are tough and can totally withstand a few crash landings, so you can build and rebuild your own drones until you come up with the perfect design. Then you can do it all again. Try different motor arrangements, add your own LEGO bricks, experiment with different shapes—this kit is a wannabe engineer’s dream.

For the more advanced STEM learners out there, Flybrix lets you experiment with coding and block-based coding. It uses an arduino-based hackable circuit board, and the Flybrix app has advanced features that let you try your hand at software design.

Who is the Flybrix LEGO Drone Kit for?

Flybrix is a really fun way to introduce a number of core STEM concepts, which makes it ideal for kids—and technically, that’s who it was designed for. But because engineering and coding can get a little complicated, the recommended age for independent experimentation is 13 and up. However, kids younger than 13 can certainly work on Flybrix drones with the help of their parents. In fact, it actually makes a fantastic family hobby.

Ready to start building your own LEGO drones? Click here to order your Flybrix kit today for $198.

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10 Tips for Watching Backyard Wildlife

Fiona the fox, exploring her territory.
Fiona the fox, exploring her territory.
Courtesy of Kerry Wolfe

Whether you live among acres of sprawling land or look out over a sliver of city sidewalk, if you pay close enough attention, you’re bound to see wildlife right outside your door. So get familiar with your nonhuman neighbors with these 10 tips for backyard wildlife watching. After all, the animals are there—whether you notice them or not.

1. Get curious.

Watching wildlife is a wonderful way to learn about the other inhabitants of your yard. “You can go out and go for a hike and walk to find something, but there’s really a value in sitting quietly in one space and seeing what comes along,” Brian Hess, a wildlife biologist with the Connecticut Department of Energy and Environmental Protection, tells Mental Floss. Charismatic creatures like deer and bears are exciting, but there’s no need to wait for something large to come ambling through. Peek between the branches of a shrub and you may find a bird nest tucked within the greenery; move a rock and you’ll likely spot worms wriggling around in the moist earth. Try varying your routine, too, as different animals become more active depending on the time of day.

2. Don’t disturb the wildlife.

A male pheasant walking
Let them strut their stuff in peace.
Courtesy of Kerry Wolfe

Treat wildlife watching as if you’re window shopping in a store stocked with stuff you can’t afford: Basically, look but don’t touch. “My general rule of thumb whenever I’m watching wildlife is if they change their behavior because of my presence, that probably means I’m too close and should back off,” Hess says.

Keeping your distance will help both you and the wildlife stay safe—and make sure any curious pets don’t get too close to wild creatures, either. An animal may attack if it feels threatened, which, as anyone who’s seen Homeward Bound (1993) knows, can lead to some pretty painful encounters. There’s also the risk of zoonotic diseases; though fairly rare, North Americans in particular have to be cautious of rabies.

Avoid feeding wildlife, too (bird feeders are fine—more on that later). Don’t chuck your dog’s uneaten kibble or your dinner scraps out the back door, as teaching wildlife to rely on people for meals can cause unwanted learned behavior and lead to human-animal conflicts.

3. Make your yard wildlife-friendly.

One of the best ways to attract wildlife is to add native plants to your yard. “You can put an oak tree in your yard, watch the life come to it, and help rebuild your local ecosystem,” Doug Tallamy, a professor of entomology at the University of Delaware, tells Mental Floss. A perfectly manicured patch of grass or an exotic shrub may look lovely, but it doesn’t create a suitable habitat for many animals. Most insects are specialized feeders, meaning they’ve evolved over millions of years to eat particular plants. Basically, if you want to see more monarchs, you better start planting some milkweed.

Short on yard space? Urban apartment dwellers can stick pots of native plants in window boxes. Adding even a tiny bit of greenery will help city animals who may not have access to as many resources as their rural counterparts.

Finding native plants is fairly simple. Organizations like the National Wildlife Federation and the Audubon Society (and if you’re in California, the California Native Plant Society) have online databases you can browse.

And, if you’re attracting birds, avoid turning your yard into a stage for Windex commercial-level crashes. If your glass is spotless, stick some decals or tempera paint onto your windows to help prevent bird collisions.

4. Maintain your bird feeder.

Though native plants are a great way to attract wildlife, you can also supplement your yard’s offerings with various bird feeders [PDF]. Make sure you regularly clean your feeders, lest the seeds get wet and grow mold. You should also rake away any discarded shells scattered on the ground, which can collect harmful bacteria. If you live in an area with bears, check with your state’s wildlife agency for their seasonal best practices regarding bird feeders, as foraging ursines love to snack on high-fat, high-protein seeds.

5. Provide water.

A red fox drinks from a water bowl in a backyard
Chasing chipmunks really works up a thirst.
Courtesy of Kerry Wolfe

A tub of water in a shady spot away from your house will help your resident critters and thirsty passersby. If you can, put a large rock or brick in the water bowl, and fill the basin so only part of the object is submerged. This will provide insects and other animals with an extra perch to land on, as they may have a tough time sipping water from a steep-sided dog dish. The rock will also give small creatures an extra escape option, should they accidentally fall into the tub and go for an unplanned swim. Make sure you clean the water bowl regularly—standing water can quickly become a soupy mess of dirt, guano, and mosquito eggs.

6. Get excited about insects!

Put away the insecticide and instead embrace your resident creepy-crawlies. You can have a lot of fun identifying the beetles and butterflies that frequent your yard. And about 90 percent of flowering plants depend on pollinators, so not only is that bee bumbling around your garden cute, it’s also playing a vital role in helping your local ecosystem.

While insects are fascinating in their own right, you can also view them as food for larger creatures. They’re a nutritious meal for animals like birds, lizards, frogs, squirrels, bats, opossums, and much more. Caterpillars in particular are a great source of grub for local and migrant bird populations. “If you want chickadees breeding in your yard, you need to have 6000 to 9000 caterpillars or the chickadees can’t rear their young,” Tallamy tells Mental Floss.

7. When looking for wildlife, use your senses.

There’s a reason avid birders get to know their bird calls. “Hearing wildlife is a great way to start to pay attention,” John Rowden, senior director of bird-friendly communities at the Audubon Society, tells Mental Floss. “Learn the sounds, and it will help you identify the animals.” And if your yard suddenly erupts with a cacophony of squirrel alarm calls, there’s a good chance there’s some sort of predator lurking nearby. Identifying the sounds of nocturnal animals like owls and raccoons will help you discern who's been coming after dark.

You may be able to smell some animals, too. Skunks unleash a notoriously stinky spray when warding off threats; foxes and mountain lions mark their territories with their own funky scents; and desert dwellers claim they can often smell javelina before they see them.

8. Look for signs animals have visited.

Squirrel Tracks in Snow on a Wooden Railing
Clear signs of squirrel traffic.
Colin Temple/iStock via Getty Images

You don’t have to see the animals themselves to find hints of their presence. A fallen feather, a muddy print, a well-walked trail etched into the dirt, and a heaping pile of scat are all clues as to who’s been sharing your yard.

9. Get technological.

Sure, watching wildlife is a great excuse to unplug, but embracing tools and technology can help enhance your experience. A pair of binoculars will transform that blurry blot in the sky into a clearly identifiable bird; a trail camera will snap footage of whatever walks through your yard when you’re not looking. Apps like iNaturalist can help you identify various species and share your findings with fellow members of the community.

10. Document your wildlife observations.

Keep a record of the creatures who frequent your yard. This will help you get a sense of their routines and better identify individual animals. You can keep your logs simple—a quick journal entry or a series of photographs is an excellent way to document your resident wildlife. As a bonus, your observations can also help with citizen science projects, such as the Monarch Joint Venture or Audubon’s Hummingbirds at Home project.