'Leaping' into the realm of science

Yesterday was Feb. 29, the extra day we add to the calendar in leap years. But why do we need this extra day, and what is the science behind it? And what about the lesser-known leap second – which delegates from more than 70 nations recently debated whether to abolish? Northeastern University news office asked Murray Gibson, dean of the College of Science, to answer these questions – as well as how early scientists discovered the need to adjust the calendar.

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