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Da Vinci Riddle

In Leonardo da Vinci, biographer Walter Isaacson notes that da Vinci was fond of riddles, including this one: Winged creatures will support people with their feathers. This is part of a complete episode.

Wet Dress Rehearsal

A wet dress rehearsal is a run-through of all the processes required before a rocket launch, up until, but not including, liftoff. What makes this simulation wet is that the rocket’s fuel tanks are filled, then drained once the countdown clock...