The idea of 10 dimensions might sound exciting, but they would cause real problems if you forget where you parked your car. - Stephen Hawking

It is a matter of common experience that things get more disordered and chaotic with time. This observation even has its own law, the so-called second law of thermodynamics.

It's the gravity that shapes the large scale structure of the universe, even though it is the weakest of four categories of forces.

There could be whole antiworlds and antipeople made out of antiparticles. However, if you meet your antiself, don’t shake hands! You would both vanish in a great flash of light.