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Which number is missing?

Correct answers: 105

The first user who solved this task is Djordje Timotijevic.

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She criticized my apartment...

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Polyethylene

In 1933, polyethylene was discovered by Reginald Gibson and Eric William Fawcett. It was one of the earliest plastics to come into common use. It was discovered by accident while reacting ethylene and benzaldehyde at high pressure. The demands of war and the need for a better insulator for cables stimulated the development of polyethylene and it played a key role in the development of radar.

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