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Radmila Gavrilov

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173. Daniela Jakubovski 19
174. Kathy Wu 18
175. Radmila Gavrilov 18
176. Bratislav Rančić 18
177. Lynette Fairhurst 18
last 3 solved tasks
What number should fill in the blank? (8, 43, 11, 41, ?, 39, 17)
What will be the missing number? (9, 19, 40, ?, 170)
If 87+92=18, 57+83=13, 12+61=4 then 62+31=?

Arthur Jeffrey Dempster

Born 14 Aug 1886; died 11 Mar 1950 at age 63.Canadian-American physicist who in 1918 built the first mass spectrometer (based on the invention of Francis W. Aston) and discovered isotope uranium-235 (1935). The mass spectrometer is an instrument that uses electric and magnetic fields to separate and measure a sample's atoms according to their mass and relative quantity. In 1935, he discovered that naturally occurring uranium, though mostly uranium-238, contained 0.7% U-235 (later used as the primary fuel in atomic bombs and reactors after Niels Bohr predicted it could be used to produce a chain reaction releasing huge amounts of nuclear fission energy). During WW II, Dempster worked with the secret Manhattan Project that developed the world's first nuclear weapons.«

People who wonder whether the glass is half empty or half full

People who wonder whether the glass is half empty or half full miss the point. The glass is refillable.
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