How to make a snail ball that rolls very slowly down an incline - Boing Boing
I don't want to give away the secret inside this ball that rolls down a hill so slow it seems like it is going through molasses. Try to figure it…
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Snail Ball
You have 2 balls with identical diameter and weight. One is solid, one is hollow. You can't tell by knocking on them. How can you find the solid one? - Quora
homework and exercises - Tricky conceptual question: ball sliding and rolling down incline - Physics Stack Exchange
Those who dream by day are cognizant of many things which escape those who dream only by night - ART FLAIR
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