#OnThisDay: On December 25, 1656, Dutch scientist Christiaan Huygens invented the first pendulum clock, that improved daily timekeeping accuracy from 15 minutes to just 15 seconds. #MIG
#OnThisDay: On December 25, 1656, Dutch scientist Christiaan Huygens invented the first pendulum clock, that improved daily timekeeping accuracy from 15 minutes to just 15 seconds. #MIG