There are two kinds of light--the glow that illuminates, and the glare that obscures.
James Thurber (1894 - 1961)
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Events
1885 - The first successful appendectomy is performed by William W. Grant.
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1959 - Luna 1 becomes the first spacecraft to reach the vicinity of the Moon.
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Take a look at the following two circles. At the center, they're both the identical bright white. But which one seems brighter?
Let's make this a poll:
I'm not sure if this illusion will work when respondents know the objects are the same brightness, but naive viewers will reliably rate the…