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ctpeko3a

Relativity explained with four-letter words

Einstein's General Theory of Relativity lucidly explained -- using only
words of four letters or less. Get a load of this.
We have Bert and Dana. Take a bus, and put Bert on the bus. The bus goes
down the road. Dana, she sits here, on the side of the road. He's in the bus
and she's on her ass. And now take a rock off of the moon, and let it fall
at them. It hits the air and cuts in two. The two bits burn, and then land
just as Bert and Dana are side by side. One hits the dirt up the road a
ways, and one hits down the road a ways. Dana sees each rock at the same
time, but Bert sees one rock and then sees the next rock. Now: if Bert and
Dana both see Dana as the one who is "at rest", they both will say that the
two bits came down at the same time. Dana will say, "I am 'at rest', and I
saw them both land at the same time, so they both did, in fact, land at the
same time." And Bert will say, "I move away from the rock down the road, so
when I add that fact in, I can see that if I were 'at rest', I'd have seen
both land at the same time. So it must be the case that they did land at the
same time." Okay, but what if Bert and Dana now see Bert as the one who is
"at rest"? Eh? You get to pick who is "at rest" and who isn't, no? So make
Bert be "at rest". Now Bert will say, "I am 'at rest', so the one up the
road beat the one down the road, on the way to the dirt, just the way I saw
it." And Dana will say, "I saw them land at the same time, but I move away
from the rock up the road, so when I add that fact in, I can see that the
rock up the road must have beat the one down the road."
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