If I remember, rail and tracked systems were used in quarries and mines to transport heavy loads using people or draft animals long before mechanized...
This is one case in which the anthropic principle is actually applicable. We can't really tell how rare it is because we are by necessity living in a...
The FLRW metric doesn't conserve energy because it doesn't have a timelike killing vector field, ie it isn't a static spacetime. That is an invariant...
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"
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