Cafe Science

Why are some people racist, but others are not?

The average person experiences dozens of individual itches each day. We've all experienced the annoyance of an inconvenient itch - but have you ever pondered why we itch in the first place? Is there actually an evolutionary purpose to the itch, or is it simply there to annoy us? Emma Bryce digs deep into the skin to find out.

Scientists are taking cancer patients' immune cells and engineering them to fight cancer. How does it work?

Clint Buffington has found 83 messages in bottles - and you could probably do it too. Vox's Zachary Crockett and Phil Edwards found out how.

Being able to sense time helps us do everything from waking and sleeping to knowing precisely when to catch a ball that's hurtling towards us. And we owe all these abilities to an interconnected system of timekeepers in our brains. But how do they work? Marco A. Sotomayor details how human bodies naturally tell time.

So maybe we can't outrun cheetahs or antelope, but humans are uniquely adapted for long distance running. What does science have to say about marathon running? To find out, (and because I was feeling a little crazy) I decided to run one!

Trace and Amy get their DNA test results, and we talk to an expert about how scientists actually get genetic information out of DNA.

The meter is the world's ultimate measure, but how did it become "the" meter? What is this measurement based on? The story of this revolution in measurement traces its roots to the French Revolution. Scientists decided that an equal and united people should have equal and united measures. So they sent a pair of young astronomers out to measure the world, and invent the meter. Little did they know they'd find nothing but war, deception, and strife along the way. As a result of this ill-fated mission, the meter carries an error that still persists today. Still think the metric system is so perfect?

See Through engine in slow motion.

Engineers at MIT have found a way to prevent hydrogels from dehydrating.

Building a perfect igloo takes cool science!

Thanks to Google Making and Science for supporting this series, and to Sean Carroll for collaborating on it!

1 tablespoon of olive oil destroys half an acre of waves on this lake. What The Physics?!

Teflon was in the spacesuits the Apollo crew wore for the moon landing, in pipes and valves used in the Manhattan project, and it may be in your kitchen, as the nonstick coating on frying pans and cookie sheets.

This is a the musical Tesla coil used in the video, It was a lot of fun and I recommend getting one!

There are cosmic snipers firing at random into the unvierse. What are they and what happens if they hit us?

Used in everything from bullet-proof vests to the walls of the Pentagon, polyurea's strength comes from its long-chain molecules.

The crazy story of the arbitrary temperature scale used in a tiny minority of countries.

What exactly makes a journey to Mars so perilous? Is it okay to touch Martian dirt with your bare hands?

Silicone oil droplets provide a physical realization of pilot wave theories.

Solving a 5 yr old personal mystery about "Why Water Walks on Water".