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Ben Crowell earned this badge 8 times
jun 12 at 15:02MRI's and Electromagnetic Radiation
jun 2 at 19:52Why does light of high frequency appear violet?
may 16 at 13:37Rough, easy DIY method of measuring magnetic field strength
may 3 at 2:27The status / acceptance of block time?
aug 20 '11 at 0:08existence of other forces obeying inv square law
jul 25 '11 at 23:13electron orbits
jul 20 '11 at 9:53The Pioneer anomaly finally explained?