Sunday Challenge: Tick-tock, can you beat the clock this week? (Featured in the image are our mechanical hourglass Oscilloglass Timers available online and in store) Answer to last week’s Sunday Challenge: The shocking answer is that if 15 people choose a random card from their own deck of 52, the odds that one will match is 90%! This brain teaser is based on the classic “birthday paradox,” a highly counterintuitive example of probability which proves that in a room of 23 people, there is a bett