Nothing, but the key to progression is to at one point surpass the findings of the past.

Various times, but that's the beauty of it. Even when it's wrong it has the ability to include new methods, thoughts, and ways to improve the result to fit a more precise and concrete answer. There will be a time when Einstein's theory will be deemed wrong. Science is ever growing.

Popplio.

Once.

'_>'

'<_'

'_>'

'_>'

Holy water is full of salt. Why do you think it taste good? '_>'

oink. '_>'