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How to Use Your Knuckles to Remember the Number of Days in Each Month

Our ancestors just dragged them along the ground, but you can put your knuckles to good use with this neat trick.


  • Step 1: Position hands Ball your hands into fists and hold them front of you.
  • Step 2: Begin on the left Count the months on your knuckles and the grooves in between, starting with January on your leftmost knuckle, which is your left pinky.
  • Step 3: Count Don't count your thumb's knuckles or any space between your hands. Each of the seven months that land on a knuckle will be months with 31 days. The five months that fall on the grooves all have 30 days.
  • Step 4: Remember February Remember the one exception – February – that falls on a groove. It has 28 days, or 29 in a leap year.
  • TIP: This trick works just as well using your feet instead of your hands.
  • Step 5: Try one hand Try this trick with one hand, too. When you get to the last knuckle, loop around and continue counting on the first knuckle.
  • FACT: Julius Caesar, on the advice of the Greek astronomer Sosigenes, invented the leap year in the year 46 B.C.E.

You Will Need

  • One or two hands
  • One or two feet (optional)

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