The leap years

Why do we add an extra day to the month of February every four years? Does it carry some cultural or historical significance? Does it relate to weather or agricultural cycles? Do we even need leap years? Dr. Michio Kaku visited with Jamie Wax on ‘CBS This Morning’ to offer real answers. Kaku explains the history, the math, and the science that all gave rise to the leap year as we know it. WATCH NOW!

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