How have clocks and watches intertwined with our sense of time? When did they come to play central roles in our lives? To answer these questions, On Time from the National Museum of American History ...
A clock with hands (an analogue clock) shows us the numbers 1-12. There are 24 hours in one day, so we measure time by splitting the day into two halves. The first 12 hours of the day, from ...
What is the molecular clock? Levels of molecular variation could be used, in principle, to estimate divergence times, serving as evolutionary "clocks" that "tick" at different rates. Subsequent ...
Sunrise alarm clocks mimic the gradually brightening light of the sun to ease you out of sleep. Think of it as a biological hack. “We evolved to align our sleep-wake cycles with the sun ...