12 strange reasons humans haven't found alien life yet
Scientists have been searching for evidence of extraterrestrial life for decades. So, where are all the aliens? Here are 12 intriguing theories ...
Countdowns
Latest
The 9 most massive numbers in existence
From the humble trillion to Graham's number, here are some of the most massive numbers ever conceived by humans.
32 physics experiments that changed the world
From the discovery of gravity to the first mission to defend Earth from an asteroid, here are the most important physics experiments that changed the world.
32 things on Mars that look like they shouldn't be there
The more scientists study the Red Planet, the more they find unusual objects and patterns scattered across Mars' surface. Here are some of the most baffling.
32 alien planets that really exist
Beyond our solar system, countless alien worlds of lava, ice, water and noxious gas swirl through the cosmos. Here are some of the strangest exoplanets that scientists have discovered so far.
32 weird ways to fight climate change that just might work
From "MooLoos" to painting mountains, these silly scientific suggestions could actually help with climate change.
32 of the world's smartest animals
Though measuring animal intelligence is tricky, some animals show remarkable cognitive abilities that may rival our own.
21 of the best conspiracy theories
Conspiracy theories that have taken hold range from a faked moon landing to Barack Obama's birthplace to chemtrails.
How to tell you're in love with someone, according to science
Reference Your brain and behaviors tell you you're in love in a variety of ways. Here's 14 signs you've been struck by Cupid.
6 extinct species that scientists could bring back to life
De-extinction — the science of resurrecting extinct species — is progressing in leaps and bounds. Here are six creatures that researchers could bring back to life.
32 truly bizarre deep-sea creatures
From worms with squid-like tentacles to fish with teeth on their tongues, here are some of the most alien-looking creatures in the deep ocean.
Mayday! 22 mysterious shipwrecks you can see on Google Earth
Google Earth has captured images of rotting and rusting hulls that are wasting away in shallow waters the world over.
10 of the deadliest superbugs that scientists are worried about
These bacteria have evolved the ability to resist treatment with antibiotics, leaving doctors scrambling to help patients who are infected.
32 of the most venomous animals in the world
Venom evolved hundreds of millions of years ago, creating a chemical arms race between predatory and prey. Here are some of the most venomous animals living on Earth.
32 important scientists you've probably never heard of
These scientists may be lesser known than Einstein and Newton, but they made giant contributions to science, including astronomy, physics, chemistry and medicine.
12 game-changing moments in the history of artificial intelligence (AI)
From Alan Turing's seminal paper to the advent of ChatGPT, here are 12 pivotal moments in the history of artificial intelligence.
7 scary diseases you can get from the water
Many deadly infections are transmitted via water, including cholera, typhoid and brain-eating amoebas.
