The Sawstop system induces an electrical signal onto the blade and then monitors that signal for changes. The human body has a relatively large inherent electrical capacitance and conductivity- if the system detects this, the blade drops out in 5 miliseconds! Check out the video when the saw comes in contact with a hotdog..
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A skydiver with jet engines strapped to his feets jumped from a balloon. He was the first human to fly a jet without a jet. Here is a video of the event.
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In 1927 Professor Parnell heated a sample of pitch and poured it into a glass funnel with a sealed stem. Three years were allowed for the pitch to settle, and in 1930 the sealed stem was cut. From that date on the pitch has slowly dripped out of the funnel - so slowly that now, 72 years later, the eighth drop is only just about to fall.
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