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These seem pretty easy to answer even for a non-expert.
0[anonymous]
Save energy, I think a smart 10-year-old would be able to give decent answers to all of those. You pretty much can't use the words without knowing what they mean.
Edit I do think energy is a good one, though. Or maybe "why is energy conserved?"
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
If you have any comments about the Open Thread posts themselves or this post specifically, please post them as a reply to the [META] comment. Aside from that, this thread is as organized as you collectively wish to make it.