Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.
Stephen HawkingMy expectations were reduced to zero when I was 21. Everything since then has been a bonus.
Stephen HawkingAny physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.
Stephen HawkingMy expectations were reduced to zero when I was 21. Everything since then has been a bonus.
Stephen Hawking