In 2006, physicist Dr Piers Barnes won an Ig Nobel Prize for his work in determining how many shots of group of people it would take to ensure that no one in the photo is blinking. Rule of thumb for calculating the number of photos: Groups under 20, divide the number of people by three if there's good light, and two if it's bad. Groups over 50: good luck. Read more here. (Cautionary note: math is involved.)
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