One study of hospital admissions in Michigan found a 24 percent uptick in heart attacks on the Monday following the switch to Daylight Saving Time. The exact cause is unknown, but some doctors speculate it’s connected with the disruption of the body’s internal clock.

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22 Questions About Time and Timekeeping Answered

Humans, arguably, have been measuring time ever since they began tracking the rising and setting of the Sun. That means horology—the study of time’s measurement—has a very long history. This list is a brief horological primer. Earlier versions of these questions and answers first appeared in the