Today on Crash Course Anatomy & Physiology, Hank breaks down the parts and functions of one of your body's unsung heroes: your epithelial tissue.
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Epithelial Tissue Creates...

Voyager 1 may be out of our solar system (and 40+ years old) but we're still getting plenty of new data from our interstellar space probe.

Everyone does it -- using oil, that is. But how much do we have left? How do scientists find it? And where are they looking for it now that the easiest pickings have been taken? Hank has the answers to the how, why and how...

SciShow explains why stars do that twinkling that all the kids are singing about, and explains how astronomers can get around it to make observations, and why it can be kinda useful.

Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

Today we’re talking about heat transfer and the different mechanisms behind it. We’ll explore conduction, the thermal conductivity of materials, convection, boundary layers, and radiation.

Waterfalls are pretty amazing, but have you ever wondered how they form? Jessi's got the answer! Join her to learn all about how rivers carve waterfalls and then take a look at Angel Falls, the tallest waterfall in the world!

Over its lifetime, the Earth has seen plenty of climate change. About 50 million years ago the planet experienced extreme cooling, and all from a little fern.

In 2010, South Korea experienced a particularly cold winter. People couldn't activate their smartphones while wearing gloves, so they began wielding snack sausages— causing one company to see a 40% rise in sausage sales. So, what could...

Mountains are some of the biggest things in the world, but today, we're going to teach you how to make some of your own, right on your kitchen table!

In the Zagros Mountains of Iran lie some strange, multi-colored glaciers that don’t melt, even in the heat of summer. But, in a rainstorm, these glaciers will start to dissolve away.

It's Earth Science time!!!! In this field, natural philosophers were asking questions like, what’s up with fossils? Are they the remains of extinct organisms? Or are they so-called “sports of nature”—rocks that just happen to look like...

In this video Paul Andersen explains how covalent network solids form elementally (like graphite) or by combining multiple nonmetals (like quartz). Covalent network solids contain elements from the carbon group because they have four...

From wasps nests to nuclear reactors. Here are just a few clever ways archeologists figure out how old something is.

Artificial intelligences that play abstract, strategic board games have come a long way, but how do their "brains" work?

A SciShow Kids viewer has asked us: What is dirt made of? Join Jessi to get the dirt on … dirt!

It's raining where Jessi and Squeaks live, so they decided to bust out some books and read up on a special kind of forest where it rains almost every day!

Hank introduces us to the "simplest" of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as "animals" has been called into question because they are so simple) and finishing with the most complex...

Or why we live on an onion made of magma

Have you tried to dig a deep hole? So deep that you could dig all the way to the other side of the Earth? It's pretty hard, and lots of people have tried. So what's stopping us from digging through the Earth? It has something to do with...

Anatomy & Physiology continues with a look at your biggest organ - your skin. -- Table of Contents: All About Skin 0:22 Epidermis, Dermis, & Hypodermis 1:30 Melanin And Keratin Cells 2:15 Ensure You Get A Good Tattoo 8:01

We all know that the Earth is huge, but what is it made of? Join Jessi and Squeaks for a fun activity to learn about Earth's layers, and to make your own model of Earth!

New ReviewThe power of density!

New ReviewThis program explains how fossils are helpful in understanding they history of Earth. Colorful video footage illustrates how fossils are often found in sedimentary rock layers that provide evidence of the relative age of ancient life...