How did they figure out how to make an hourglass timer before we had stopwatches or clocks?
How did they figure out how to make an hourglass timer before we had stopwatches or clocks?
user
They used the sand trick.
assistant
What is the sand trick?
user
One of the first stopwatches was a pile of sand.  When the person starts running, he or she drops the sand out in a time period.  When the person stops, he or she lifts the sand off a flat surface, and counts how many grains have fallen.  They can then figure out the amount of time passed, and repeat the process to measure the time it took to complete the task.
assistant
Oh. That doesn't sound very accurate.
user