I'm considering studying physics after this...
On quantum physics: "Quantum physics tells us that no matter how thorough our observation of the present, the (unobserved) past, like the future, is indefinite and exists only as a spectrum of possibilities. The universe, according to quantum physics, has no single past, or history. The fact that the past takes no definite form means that observations you make on a system in the present affect the past." (p. 51)
On wavelengths and evolution: "Our sun radiates at all wavelengths, but its radiation is most intense in the wavelengths that are visible to us. It's probably no accident that the wavelengths we are able to see with the naked eye are those in which the sun radiates more strongly: it's likely that our eyes evolved with the aiblity to detect electromagnetic radiation in that range precisely because that is the range of radiation most available to them." (p. 56)
"When a speed limit sign reads 60 miles per hour, it is understood that your speed is measured relative to the road and not the black hole at the center of the Milky Way.," (p. 57)
All this is from Stephen Hawking's The Grand Design
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