What we usually consider as impossible are simply engineering problems... there's no law of physics preventing them.

Physicists are made of atoms. A physicist is an attempt by an atom to understand itself.

Growing new organs of the body as they wear out, extending the human lifespan? What's not to like?

Modern thinking is that time did not start with the big bang, and that there was a multiverse even before the big bang. In the inflation theory, and in string theory, there were universes before our big bang, and that big bangs are happening all the time. Universes are formed when bubbles collide or fission into smaller bubles.

Hover boards, unfortunately, currently violate the laws of physics. Supermagnets exist, but they have to be cooled to near absolute zero, and they are extremely expensive. So Michael J. Fox's hover boards are not possible until we invent room temperature super conductors.

An event horizon, or the point of no return, is only a byproduct of the bending of space. However, electricity and magnetism, by themselves, have no event horizon. It gets complicated, however, if a black hole has charge, and then this new solution does have an event horizon.

What do oil company executives, vampires and NASA bureaucrats all have in common? They fear solar energy.