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Post by Phil on May 16, 2013 18:17:16 GMT -8
Some things we see every day but never really understand how it's done. Like zip fasteners and velcro (ok, so you know those two, but there are lots of other things you or another Cruncher may not. Me, especially).
If you have something that puzzles you, or if you know how something works that you think others may like to know, write about it here.
My first one: When a fly lands on the ceiling, does it use a "loop-the-loop" action (i.e. headup) or a "barrel-roll" action (i.e. roll sideways)?
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Post by Phil on May 22, 2013 22:28:52 GMT -8
If gold is so heavy, why isn't it all down at the centre of the earth?
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Post by Phil on May 22, 2013 22:35:36 GMT -8
Can a piece of paper have only one surface?
Yes, it's called a Mobius strip, and you can make one like this:
Get a strip of paper about 400mm long and 20mm wide. Sticky-tape the two ends together, but first give the strip a half-twist (180deg) And there you have it.
If you take a pencil and draw a line around the loop, when you get back to the start there's a line across all of the surface area (both sides).
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Post by Phil on May 30, 2013 2:24:45 GMT -8
If diamond is the hardest material, how do they cut it to shape it?
(if I keep posting, someone may take up the thread).
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