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Anh Chí Tuấn

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What is the missing number?

Bernhard Voldemar Schmidt

Born 30 Mar 1879; died 1 Dec 1935 at age 56.Astronomer and optical instrument maker who invented the telescope named for him. In 1929, he devised a new mirror system for reflecting telescopes which overcame previous problems of aberration of the image. He used a vacuum to suck the glass into a mold, polishing it flat, then allowing in to spring back into shape. The Schmidt telescope is now widely used in astronomy to photograph large sections of the sky because of its large field of view and its fine image definition. He lost his arm as a child while experimenting with explosives. Schmidt spent the last year of his life in a mental hospital.

Brian Regan: Unilingual

Can you imagine being bilingual? Or even knowing anybody that was? Im not even unilingual. Actually, I shouldnt say that. I dont give myself enough credit. I know enough English to, you know, get by. I can order in restaurants and stuff.
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