This Sunday, we will all dutifully set our clocks back one hour for daylight saving time. But why is our day divided into 24 hours, each hour divided into 60 minutes, and each minute into 60 seconds?

Being able to run non-stop for 30 minutes straight is quite an accomplishment, especially if you struggled to make it around the block when you first started. When you do reach that 30-minute marker, ...