Witold Pilecki, a Polish soldier, volunteered to be imprisoned in Auschwitz in order to gather information, escape and let the world know about the Holocaust.

In order to discover that penguins sleep more deeply in the afternoon, scientists crept up on sleeping penguins at different times of the day and poked them with a stick until they woke up.

6 months before the Challenger disaster a lone engineer told his superiors about the O-Ring problem and warned the result “would be a catastrophe of the highest order: loss of human life.”