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Nemanja Katanic

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105. Emilie Lavigne 88
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107. Nemanja Katanic 84
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last 3 solved tasks
NUMBERMANIA: Calculate the number 2632 using numbers [7, 5, 1, 1, 29, 326] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Can you count the number of squares in the picture?
MATH PUZZLE: Can you replace the question mark with a number?

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.«


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