There was a secret inside the envelope in the hands of Stephan Schlamminger, one of the world’s leading experts in experimental tests of gravity. He appeared to be on the verge of opening the envelope ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Gravity is everywhere. It’s the force that anchors the Earth in ...

Let’s say you want to know what it's like to walk on the moon. Is there any way to simulate a moonwalk while staying on Earth? Well, yes. In fact, there are several. But before we get to them, why is ...