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HERNAN ALFREDO GARCIA ERAZO

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MATH PUZZLE: Can you replace the question mark with a number?
Can you name the athletes by the picture?
If abc96 + 29920 = 4bca6 find number abc. Multiple solutions may exist.

First photo of sun

In 1845, the first surviving daguerrotype photograph showing details of the sun was taken by French physicists Armand Fizeau and Léon Foucault. The 5-inch (12 cm) image had an exposure of 1/60 second, and showed the umbra/penumbra structure of several sunspots, as well as limb darkening. The photographic process was new: Daguerre perfected the daguerrotype only a few years earlier, in 1838. Fizeau and Foucault had been collaborating with their own experiments on the process since 1839. Fizeau had much improved the durability of a daguerrotype image with a treatment, published in Aug 1840, using a solution of chloride of gold mixed with hypo-sulphite of soda, then heated over a spirit-lamp.«

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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