Topic: health

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The Snail-Smashing, Fish-Spearing, Eye-Popping Mantis Shrimp

The mantis shrimp is a fascinating creature. One kind impales prey with a spear-like appendage and another smashes prey with a built-in club — the fastest attack in the animal kingdom. "At 30 times faster than the bli...

Toothpaste – Ingredients With George Zaidan

Cultures throughout history have tried a variety of things to clean their teeth... Egyptians and Babylonians brushed with twigs around 3500-3000 BC. In 5000 BC, a recipe of ox hooves, eggshells, myrrh, and pumice woul...

What causes cavities?

When a team of archeologists recently came across some 15,000-year-old human remains, they made an interesting discovery: the teeth of those ancient humans were riddled with holes. So what causes cavities, and how can...

3D printing ‘hyperelastic bone’ to mend injuries

Hyperelastic bone may be a 3D-printed solution for helping to mend our bones in the future. Cost-effective and customizable, the material is both a "structural element and a scaffold for bone regeneration," as shown i...

Evolutionary branching in action: Bacteria adapt to antibiotics

Watch E. coli bacteria encounter increasing strengths of antibiotics, the medicine that we use to fight infections or infectious diseases. A team led by Harvard Medical School's Michael Baym set up the video demonstra...

The Importance of Staring Out Of The Window

Staring out the window is often associated with a lack of attention or productivity, but in this film from The School of Life, we examine the activity (or lack of activity) as a highly productive pursuit that we might...

Why do some people have seasonal allergies?

If you've ever experienced watery eyes, sneezing, runny nose, itchy throat, and other allergic reactions during springtime, or you haven't but you know someone who has, this beautifully animated TED Ed by Eleanor Nels...

A hippo gets his teeth brushed

At the Tennoji Zoo in Osaka, Japan, hippo hygiene is important. Thanks to training and consistent routines, hippopotamus Tetsuo understands how to get his teeth brushed (and get a quick physical check-up) from the car...

How do eyes work & how do glasses help us see?

Glass, water, and the eye are three different transparent mediums that change the direction of light, a phenomenon called refraction. Refraction in the eye helps us see by bending light into an accurately focused poin...

The Science of Skin Color – TED Ed

When ultraviolet sunlight hits our skin, it affects each of us differently. Depending on skin color, it’ll take only minutes of exposure to turn one person beetroot-pink, while another requires hours to experience the...

Save the salamanders, unsung heroes of the forest

In an effort to avoid a "salamandergeddon" in the United States, the extinction of entire species of salamanders and other amphibians by a fungal disease known as Bsal, the U.S. banned the import of more than 200 spec...

This is What Outer Space Does to Your Body

NASA astronaut, engineer, and former football player Leland Melvin explains how the human body changes when it leaves the confines of Planet Earth. Your body may become taller, your heart might get smaller and change ...

How Far Do Sneezes and Vomit Travel? – Gross Science

Let's enter the world of sneeze experiments and vomiting machines with Anna Rothschild as she explains just how far the tiny liquid particles from sneezes and vomit can travel... and it's farther than you think. 'Vomi...

Mimicking shark skin to combat superbugs – Think Like a Tree

In 2001, materials scientist Dr. Anthony Brennan observed that Galapagos Sharks are barnacle and algae-free due to the micro-topography of their skin. These diamond pattern nanoridges also make it difficult for bacter...

A surgical robot delicately stitches a grape back together

In 2011, there was news that a surgical robot could deftly peel a grape with multiple efficient pincers. Now, the da Vinci Surgical System has demonstrated modern surgical technology by delicately stitching a grape ba...

Fig. 1: How Much Sugar Are You Really Eating?

The average American eats 19.5 teaspoons (82 grams) of sugar every day... that's around 66 pounds of sugar every year for each person. How are we consuming that amount? From Fig. 1 by University of California, learn m...

Classic Sesame Street: Broken Wrist

Breaking an arm, a leg, or some part of the body can be super scary. Not only does it hurt, but you may not know what's going to happen next. We love this classic Sesame Street video because it helps explain what to e...

Reptile Rejuvenation – Wild Inside the National Zoo

In this episode of Wild Inside the National Zoo, Reptile Rejuvenation, we get to meet three kinds of cold-blooded creatures that are warmly cared for: Aldabra Tortoises, a Grand Cayman iguana, and a Komodo Dragon name...

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