In most of North America this weekend we will be moving our clocks forward by one hour for Daylight Saving Time. Last night’s edition of NBC Nightly News had an interesting story about the correlation between moving clocks forward by one hour and an increase in cases of heart attacks. The video of the story is embedded below.

After watching the story above your students may be wondering about the reasons for Daylight Saving Time. The following videos offer concise explanations of Daylight Saving Time.

And although it’s not about daylight saving time, this TED-Ed lesson about the standardization of timezones is worth watching.