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1,664 results
Hello, guys! In this video you'll see a quite vivid example of a photochemical reaction! Thank's for watching! ===== Don't forget to ...
29,915 views
5 years ago
On July 26, 1943, Los Angeles was blanketed by a thick gas that stung people's eyes and blocked out the Sun. Panicked ...
1,018,889 views
6 years ago