If quantum physics states matter doesn't exist when it's not being noticed, then, without life, would the universe cease to exist? originally appeared on Quora: the place to gain and share knowledge, ...

I have been fascinated with living things since childhood. Growing up in northern California, I spent a lot of time playing outdoors among plants and animals. Some of my friends and I would sneak up ...

In the past decade an extraordinary claim has captivated cosmologists: that the expanding universe we see around us is not the only one; that billions of other universes are out there, too. There is ...