Topic: cells

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What Really Causes Sunburns?

Why does your skin turn red and peel when you get a sunburn? In this episode of Gross Science, Anna Rothschild explains what's going on in our skin when it burns from sun exposure.

Hunting for microbes in Central Park’s murkiest waters

Follow biologist Sally Warring into New York City's Central Park as she collects water samples from fountains and ponds to find instagrammable microbes. From her site PondLife.com: All free-living life forms are m...

How Old Is Your Body, Really?

Have you ever heard the statement that the cells in your body are completely replaced every seven years? Is this true? In this beautifully illustrated episode of Skunk Bear, NPR's Adam Cole explores how long our diffe...

Explaining The Tree of Life

Travel millions of years through time with Sir David Attenborough as he explains The Tree of Life. Some background on the metaphor from The New York Times: In his 1859 book “On the Origin of Species,” Charles Darw...

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...

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...

Jump In Jerboas – Science Friday

"A furry little rodent version of a Tyrannosaurus Rex," the jerboa has tiny forelimbs, a "noodle" tail that helps with them with balance, long legs and really long feet, with toes that support their speedy hops. W...

How do we know what color dinosaurs were?

The meat-eating microraptor was a black-feathered, four-winged dinosaur. How do we know its feathers were black? The evidence is in the microraptors' fossils. This TED Ed explains. Plus, more from Wikipedia: In Mar...

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 do your eyes perceive color? – Physics Girl

When we talk about mixing colors, it's often because we're mixing paint, but what about light? The retinas in our eyes respond to light differently because of two types of photoreceptors: rods and cones. Rod cells hel...

The Meat of the Future – How Lab-Grown Meat Is Made

In 2013, Maastricht University physiologist Professor Mark Post created a lab-grown burger patty using muscle cells from a cow -- a world first, and a possible solution to the resource challenges that come with raisin...

Can A Thousand Tiny Swarming Robots Outsmart Nature?

How might robotic engineers program a swarm of robots to accomplish tasks together based on self-organizing behaviors? Harvard research scientist Michael Rubenstein was working on that challenge when he designed Kilob...

Why do carrots taste sweeter in the winter?

From the University of California’s Fig.1 series, Molecular Biologist Liz Roth-Johnson explains why cold weather makes carrots taste more sweet: Because plants are immobile, they must develop defense techniques aga...

What Gives the Morpho Butterfly Its Magnificent Blue? – Deep Look

What does it mean to be blue? Let's look deep into something called structural coloration, the physics of light, and how it's possible that the Morpho butterfly's wings appear to be blue, despite their containing no b...

What are those floaty things in your eye? – TED Ed

Have you ever seen something small and strangely transparent float into your field of vision? ...as if it's on your eyeball? No, you're not seeing things! And no, those are not microscopic bugs or bits of dust in ...

How do wounds heal & how do scars form?

What happens when we get cut and bleed? How does skin scab over and heal? And why does skin scar? These two new vocabulary-filled TED-Eds from Sarthak Sinha get deep under our skin to give us a better understanding of...

The Animal That Wouldn’t Die: The Hydra

Just a few millimeters long and full of embryonic cells, the hydra is a small and mysterious cnidarian polyp that seems to defy mortality. Skunk Bear's Adam Cole and Robert Krulwich team up to tell the amazing tale of...

NOVA PBS: Immunity and Vaccines Explained

Why do we get shots when visiting the doctor? How do vaccines work with our immune systems to keep us from getting sick? From NOVA PBS: Immunity and Vaccines Explained. Our bodies are bombarded by bacteria and ...

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