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Venkat Katrala

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MATH PUZZLE: Can you replace the question mark with a number?

Morris William Travers

Born 24 Jan 1872; died 25 Aug 1961 at age 89.English chemist who, while working with Sir William Ramsay in London, discovered the element krypton (30 May 1898). The name derives from the Greek word for “hidden.” It was a fraction separated from liquified air, which when placed in a Plücker tube connected to an induction coil yielded a spectrum with a bright yellow line with a greener tint than the known helium line and a brilliant green line that corresponded to nothing seen before.

Light and hard

Q: What's the difference between light and hard?

A: You can sleep with a light on.

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