The Earth has had at least five major ice ages, and humans showed up in time for the most recent one. In fact, we’re still in it.
It’s the oldest light in the universe.
A terrifying sight in ancient waters, the megalodon shark was once the most feared creature in the sea.
Time dilation might seem like science fiction, but it’s not. There are astronauts circling the Earth right now who are experiencing it – though luckily nowhere near as much as Buzz Lightyear.
Frilled sharks haven’t changed for about 80 million years! And while they may look a bit like snakes from a distance, they are actually much more similar to other sharks close up.
This technology, popular when automobiles first caught on, had a short resurgence in the 1970s.
The Moon illusion is what makes the Moon look giant when you see it rising over a distant horizon. An astronomer explains what causes this awe-inspiring trick of the mind.
A curious kid asks: Why does it matter if Pluto is a planet or a dwarf planet?
Plastic is made from oil and natural gas, which started out as fossilized plant and animal material. But buried deep underground for millions of years, those materials changed in important ways.
Around 200,000 years ago, people were living who were as intelligent as us.
There’s a special type of particle called a ‘tachyon’ which would have to travel faster than the speed of light. But here’s the hitch – we can’t prove tachyons even exist.
Historians aren’t sure exactly when the first zoo was built, but it’s clear humans have kept exotic animals for thousands of years.
Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
With nine brains, blue blood and a talent for camouflage, the octopus is one of the most fascinating creatures in the sea.
The value of digital art or other digital objects depends on how much someone is willing to pay for it.
You can’t photograph the inside of a twister, but radar offers some clues.
The biggest storm on Jupiter is so big it could swallow all of Earth. But it’s now shrinking, and we’re not sure what that means.
A computer security expert explains how keys work – and how they are like passwords.
The Earth is a resilient planet, but people are altering it in ways that may take centuries to reverse.
From fibre to fabric. The process of making textiles has been important to humans for almost 35,000 years.