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voithos earned this badge 5 times |
apr 8 at 6:49
Calculations of apparent magnitude
jul 24 at 17:07
How does reflection work?
feb 14 '12 at 23:15
Why do electrons occupy the space around nuclei, and not collide with them?
oct 10 '11 at 19:55
Why does the road look like it's wet on hot days?
