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How many triangles?

MATH PUZZLE: How many triangles?

Correct answers: 78

The first user who solved this task is Djordje Timotijevic.

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April Fool's Day - Moldy sandwich

Send your kid to school with a moldy sandwich. The sandwich is fine, of course. It’s the sandwich bag that has green markings on it.

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Franz C. Schmelkes

Born 19 Aug 1899; died 11 Dec 1942 at age 43.Franz C(arl) Schmelkes was a Czech-born chemist who was best known for his discovery of azochloramid, used to sterilize wounds and burns. This compound is also known by the name chlorazodin, but its formal name is 1-(amino-chloroimino-methyl)imino-2-chloro-guanidine. The image of the strucure of this molecule shows nitrogen atoms in blue, hydrogen in grey, chlorine in green, and carbon shown conventionally by the origin of its four bonds near each end of the molecule. The chlorine which has substituted a hydrogen atom of an amino group - which is present as =N-Cl - is active as a germicide.«

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