Replace the question mark with a number
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 415
The first user who solved this task is Sanja Šabović.
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Photosensitive glassIn 1947, the development of photosensitive glass was announced publicly in Corning, N.Y. It had first been made by the Corning Glass Works in Nov 1937. The glass is crystal clear, but exposure to ultraviolet light followed by heat treatment forms submicroscopic metal particles creating an image within the glass. This is believed to be the most durable form of photographic medium, and to be as permanent as the glass itself. |