A famous crossed lunar selfie: Alan Bean's picture of Pete Conrad taking Alan's picture during #Apollo12's extravehicular activity, 52 years ago #Todaygo.nasa.gov/2g6SmjS
At Pete's left wrist, his checklist open to one of the pages on which the backup crew pasted pics of Playboy Playmates bit.ly/2fgFrhS#Apollo12, #52YearsAgoToday
The only time humans visited a probe landed before them on another world: the Apollo 12 crew visited the landing site of Surveyor 3, 52 years ago #Today during their second extra-vehicular activity go.nasa.gov/2g6SmjS
52 years ago #Today, Alan Bean and Pete Conrad walked on the Moon for the second time in human history. After the extraveicular activities, they returned back to the command module: this is a sped up video of the docking buff.ly/344KMzL#Apollo12
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Born 400 years ago #Today, Blaise Pascal was child prodigy, mathematician, physicist, inventor, writer and Catholic theologian. He was pioneer in the natural and applied sciences and invented one of the first mechanical calculators
Pascal designed and built one of the earliest mechanical calculators, known as Pascal's Calculator or Pascaline. It was a pioneering device that used gears and wheels to perform addition and subtraction. It laid the foundation for mechanical computation
He introduced the namesake Triangle, a triangular arrangement of numbers with various mathematical properties. Each number in the triangle is the sum of the two numbers directly above it.