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13 Scientific Explanations for Everyday Life

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Science holds our lives together. It explains everything from why bread rises to why you need gas to power your car. In his new book Atoms Under the Floorboards, writer Chris Woodford lays out the abstract science that underlies the everyday world, from the big (how do skyscrapers stay up?) to the small (why does my laptop get hot when I’m watching Netflix?). Along the way, he also calculates the answers to whimsical questions like, “How many people would I have to gather together to keep my house warm without heat?” (A lot, but not as many as you'd think.) Here are 11 things we learned about the world through his eyes: 

1. A power drill could set your house on fire, in theory. 

Because of friction, electric drills generate heat. The motor, the drill bit, and the wall all get hot. It takes about 2,000 joules of energy to heat one kilogram of wood just 1 degree Celsius. Assuming a typical power drill uses 750 watts of electricity, and it puts out 750 joules of energy, Woodford calculates that it would take just four minutes to set fire to a wooden wall in a 68 degree Fahrenheit room. 

2. Sticky notes come off easily because their adhesive is uneven. 

Post-it notes feature a plastic adhesive that is spread out in blobs across the paper. When you slap a Post-it onto your bulletin board, only some of these blobs (technically called micro-capsules) touch the surface to keep the note stuck there. Thus, you can unstick it, and when you go to attach it to something else, the unused blobs of glue can take over the adhesive role. Eventually, all the capsules of glue get used up or clogged with dirt, and the sticky note doesn’t stick anymore. 

3. Gum is chewy because it’s made of rubber.

Early gums got their elastic texture from chicle, a natural type of latex rubber. Now, your bubble gum is made with synthetic rubbers like styrene butadiene (also used in car tires) or polyvinyl acetate (also used in Elmer’s glue) to mimic the effect of chicle.

4. Office buildings are ever-so-slightly taller at night. 

After all the employees go home, tall office buildings get just a little taller. A 1,300-foot-tall skyscraper shrinks about 1.5 millimeters under the weight of 50,000 occupants (assuming they weigh about the human average). 

5. A LEGO brick can support 770 pounds of force.

LEGOs can support four to five times the weight of a human without collapsing. They are strong enough to support a tower 375,000 bricks tall, or around 2.2 miles high. 

6. Polishing shoes is like filling in a road’s potholes. 

Regular leather appears dull to the eye because it’s covered in teeny tiny scrapes and scratches that scatter whatever light hits the material. When you polish a leather shoe, you coat it in a fine layer of wax, filling in those crevices much like a road crew smooths out a street by filling in its potholes. Because the surface is more uniform, rays of light bounce back toward your eye more evenly, making it look shiny.  

7. You could heat your house with just 70 people. 

People give off body heat, as anyone who’s been trapped in a small crowded room knows. So how many people would it take to warm up your home with just body heat in the winter? About 70 people in motion, or 140 people still, figuring that humans radiate 100-200 watts of heat normally and that the house uses four electric storage heaters.

8. Density explains why cold water feels colder than air at the same temperature. 

Because water is denser than air, your body loses heat 25 times more quickly while in water than it would in air at the same temperature. Water's density gives it a high specific heat capacity, meaning it takes a lot of heat to raise its temperature even a little, and it's very good at retaining heat or cold (the reason why hot soup stays hot for a long time, and why the ocean is much cooler than land). Water is a great conductor, so it's very effective at transferring that heat or cold to your body. 

9. Water cleans well because it has asymmetrical molecules. 

Because water molecules are triangular—made of two hydrogen atoms stuck to one oxygen atom—they have slightly different charges on their different sides, kind of like a magnet. The hydrogen end of the molecule is slightly positive, and the oxygen side is slightly negative. This makes water excellent at sticking to other molecules. When you wash away dirt, the water molecules stick to the dirt and pull it away from whatever surface it was on. This is also the reason water has surface tension: it’s great at sticking to itself. 

10. The “pulse” setting on a blender works better because of turbulence. 

When your blender stops chopping up food and begins just spinning it around in circles, it’s because everything inside is spinning at the same rate. Instead of actually blending ingredients together, it’s experiencing laminar flow—all the layers of liquid are moving in the same direction with constant motion. The pulse function on the blender introduces turbulence, so instead of the fruit chunks rolling around the side of the blender, they fall into the center and get blended up into a smoothie. 

11. Babies’ bodies contain more water than adults.'

Adults are around 60 percent water. By contrast, newborn babies are about 80 percent water. But that percentage quickly drops: a year after birth, kids' water content is down to around 65 percent, according to the USGS.

12. Glass breaks easily because its atoms are loosely arranged. 

Unlike other solid materials, like metals, glass is made up of amorphous, loosely packed atoms arranged randomly. They can’t absorb or dissipate energy from something like a bullet. The atoms can’t rearrange themselves quickly to retain the glass’s structure, so it collapses, shattering fragments everywhere. 

13. Calorie counts are calculated by incinerating food. 

Calorie values on nutritional labels estimate the energy contained in the food within the package. To figure out how much energy is in a specific food, scientists use a calorimeter. One type of calorimeter essentially burns up the food inside a device surrounded by water. By measuring how much the temperature of the water changes in the process, scientists can determine how much energy was contained in the food.  

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Nate D. Sanders Auctions
Sylvia Plath's Pulitzer Prize in Poetry Is Up for Auction
Nate D. Sanders Auctions
Nate D. Sanders Auctions

A Pulitzer Prize in Poetry that was awarded posthumously to Sylvia Plath in 1982 for her book The Collected Poems will be auctioned on June 28. The Los Angeles-based Nate D. Sanders Auctions says bidding for the literary document will start at $40,000.

The complete book of Plath’s poetry was published in 1981—18 years after her death—and was edited by her husband, fellow poet Ted Hughes. The Pulitzer Prize was presented to Hughes on Plath’s behalf, and one of two telegrams sent by Pulitzer President Michael Sovern to Hughes read, “We’ve just heard that the Collected Plath has won the Pulitzer Prize. Congratulations to you for making it possible.” The telegrams will also be included in the lot, in addition to an official congratulatory letter from Sovern.

The Pultizer’s jury report from 1982 called The Collected Poems an “extraordinary literary event.” It went on to write, “Plath won no major prizes in her lifetime, and most of her work has been posthumously published … The combination of metaphorical brilliance with an effortless formal structure makes this a striking volume.”

Ted Hughes penned an introduction to the poetry collection describing how Plath had “never scrapped any of her poetic efforts,” even if they weren’t all masterpieces. He wrote:

“Her attitude to her verse was artisan-like: if she couldn’t get a table out of the material, she was quite happy to get a chair, or even a toy. The end product for her was not so much a successful poem, as something that had temporarily exhausted her ingenuity. So this book contains not merely what verse she saved, but—after 1956—all she wrote.”

Also up for auction is Plath’s Massachusetts driver’s license from 1958, at which time she went by the name Sylvia P. Hughes. Bidding for the license will begin at $8000.

Plath's driver's license
Nate D. Sanders Auctions
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Sagar.jadhav01, Wikimedia Commons // ;CC BY-SA 4.0
New 'Eye Language' Lets Paralyzed People Communicate More Easily
Sagar.jadhav01, Wikimedia Commons // ;CC BY-SA 4.0
Sagar.jadhav01, Wikimedia Commons // ;CC BY-SA 4.0

The invention of sign language proved you don't need to vocalize to use complex language face to face. Now, a group of designers has shown that you don't even need control of your hands: Their new type of language for paralyzed people relies entirely on the eyes.

As AdAge reports, "Blink to Speak" was created by the design agency TBWA/India for the NeuroGen Brain & Spine Institute and the Asha Ek Hope Foundation. The language takes advantage of one of the few motor functions many paralyzed people have at their disposal: eye movement. Designers had a limited number of moves to work with—looking up, down, left, or right; closing one or both eyes—but they figured out how to use these building blocks to create a sophisticated way to get information across. The final product consists of eight alphabets and messages like "get doctor" and "entertainment" meant to facilitate communication between patients and caregivers.

Inside of a language book.
Sagar.jadhav01, Wikimedia Commons // CC BY-SA 4.0

This isn't the only tool that allows paralyzed people to "speak" through facial movements, but unlike most other options currently available, Blink to Speak doesn't require any expensive technology. The project's potential impact on the lives of people with paralysis earned it the Health Grand Prix for Good at the Cannes Lions International Festival of Creativity earlier in June.

The groups behind Blink to Speak have produced thousands of print copies of the language guide and have made it available online as an ebook. To learn the language yourself or share it with someone you know, you can download it for free here.

[h/t AdAge]

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