The US government has been secretly digging tunnels for decades, with some speculating that they are being used to hold alien ...

So, let’s say the worst happens, and Earth gets invaded by aliens. Not the friendly kind offering galactic peace treaties, ...

Add Yahoo as a preferred source to see more of our stories on Google. Looking for an adventure that’s cool (literally) and completely out of the ordinary? The United States is home to some of the ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Looking for an adventure that’s cool (literally) and completely out of the ordinary? The United States is home to some of the world’s most fascinating cave systems, each with its own story carved by ...