What kind of small toys or devices click when you rotate them forwards and backwards? Seeking mechanism or design... [more inside]
posted by pallen123 on Nov 21, 2009 - 13 answers

bicyclefilter: Are there any sites or books that break down the science of a bicycle? [more inside]
posted by bluelight on Oct 29, 2009 - 9 answers

"There are only two types of motion in the universe: oscillation or rotation and you can't have exclusively one without a trace of the other. That's the reason machines wear out." Does this statement statement have any basis in fact and can you tell me where it might have originated? [more inside]
posted by bonobothegreat on Sep 18, 2009 - 17 answers

What are some simple experiments that help explain complicated phenomena? [more inside]
posted by Christ, what an asshole on Jul 6, 2009 - 15 answers

I badly need help on formalisms in Quantum Mechanics! I just read this post from 2 years ago, and it did help a little, but not really enough. [more inside]
posted by kureshii on Oct 24, 2007 - 7 answers

What is the mechanical device used in Speedlaces called? [more inside]
posted by Caviar on Dec 15, 2005 - 26 answers