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They yank the van doors open, flash lights in your eyes, order you out and herd you into a pitch-black building, barking commands: put your hands on the wall; behind your head; line up; move.

Oil for use in lamps should have an open flash test of at least 100° F. and a burning point of not less than 125° F. We say that we burn oil in our lamps, but what we really do is to heat the oil until it gives off gas, and then we burn the gas.

In his eye you may often see alternately the secret laughing expression of humour, and the sudden open flash of indignation.