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Francesco Maria Grimaldi

Born 2 Apr 1618; died 28 Dec 1663 at age 45.Italian physicist and mathematician who studied the diffraction of light. He observed the image on a screen in a darkened room of a tiny beam of sunlight after it passed pass through a fine screen (or a slit, edge of a screen, wire, hair, fabric or bird feather). The image had iridescent fringes, and deviated from a normal geometrical shadow. He coined the name diffraction for this change of trajectory of the light passing near opaque objects (though, more specifically, it may have been interferences with two close sources that he observed). This provided evidence for later physicists to support the wave theory of light. With Riccioli, he investigated the object in free fall (1640-50), and found that distance of fall was proportional to the square of the time taken.«

How many does it take?

How many members of your astrological sign does it take to change a light bulb?
Part 2:
Libra: Er, two. Or maybe one. No - on second thought, make that two. Is that okay with you?
Scorpio: That information is strictly secret and shared only with the Enlightened Ones in the Star Chamber of the Ancient Hierarchical Order.
Sagittarius: The sun is shining, the day is young and we've got our whole lives ahead of us, and you're inside worrying about a stupid light bulb?
Capricorn: I don't waste my time with these childish jokes.
Aquarius: Well, you have to remember that everything is energy, so...
Pisces: Light bulb? What light bulb?
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