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Is Friday the 13th really more common? I counted 400 years to find out

The superstition claims Friday the 13th is unlucky. It turns out it's also, very slightly, the most likely — the 13th lands on a Friday more often than on any other weekday.

  • Friday the 13th appears slightly more often than other weekdays over 400 years.
  • Friday the 13th occurred 688 times in the 400-year cycle.
  • Leap years added an extra week in 71 of the 400 years, affecting the distribution.
Japan aims for the moons of Mars

Japan aims for the moons of Mars

Japanese scientists are readying a mission to Mars' moons to retrieve samples that may unlock the origins of the solar system and life on Earth, although a rival Chinese mission aims to make it back…

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