The short answer is 4.54 billion years old. But how do we even know that? And what happened during all those billions of years before humans evolved?
Meet Clever Hans, the horse that could do math…or could he?
At the beginning of the 20th century, a horse became famous for seemingly knowing how to do math. Hans couldn’t actually do math but was very clever. This video explains how humans and animals pick up on tiny clues that let it seem like they know more than they do.
What causes headaches?
We all get them. And we usually learn what can trigger a headache. But what’s going on inside our body when we feel that pain?
There’s a mud puddle that moves
What. Even. This mud puddle moves 20 feet per year. Once it jumped 60 feet in one day. Learn its story.
Why does February only have 28 (or 29) days?
It’s a question we’ve all asked as children. Short version: blame the Romans. Long version: watch the video.
It took 50 years to develop mRNA vaccines
mRNA vaccines are a huge game-changer
Where do superstitions come from?
How did it happen that people all over the world avoid stepping on cracks in the sidewalk or feel frightened of black cats? The story behind why we believe in superstitions is just as weird as some of the superstitions we have.
What are mRNA vaccines and how are they developed?
This is a great — although a little advanced — explanation of the development of vaccines and how mRNA vaccines are a new technology that may help us beat all kinds of diseases.
Could you actually live on Mars?
Here are a few things to bring with you to the red planet and some information on living there.
This ball point pen changed the world
The BIC Crystal arguably changed the world. It’s been in constant production for over 70 years and its design has been barely changed in that time.