The Limits of Science

Science has taught us many things: There's water on mars, the human genome is really big, time and space are all bendy, and a golf ball hit on the surface of the moon will go really far.

But what has science told us about the sandwich? I have two specific questions:

1. Why does a sandwich taste better when someone else makes it?
2. Why does a sandwich taste better when cut in half diagonally?

Get on it, science!