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Find number abc

If 70ba9 + a4ccb = 12a197 find number abc. Multiple solutions may exist.

Correct answers: 1

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Room for fungi

How much room is needed for fungi to grow?

As mushroom as possible.

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Earliest U.S. celestial photograph

In 1839, John William Draper took a daguerreotype of the moon, the first celestial photograph made in the U.S. He exposed the plate for 20 minutes using a 5-inch telescope and produced an image one inch in diameter. Draper was a professor of chemistry at New York University, New York City. His research in the effect of light upon chemicals had led him to take up photography. He also made his first satisfactory photographic portrait in 1839. A picture he took (1840) of his sister is the oldest surviving photographic portrait. Draper made important scientific contributions in fields of radiant energy, photochemistry, photography, and electric telegraphy. He also anticipated development of spectrum analysis.

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