If a tree falls in the forest, and no one is around to hear it, does it make a sound? According to quantum theorists, that tree might not even exist until it is observed. So, is our world just an ...

Every time a coffee mug drops, a satellite orbits or an astronaut floats, we are watching the same phenomenon play out under very different disguises. For centuries we have treated gravity as the ...

(via Sabine Hossenfelder) Over the past few decades, the idea that gravity is not a fundamental interaction but is instead caused by the increase of entropy has become increasingly popular in the ...