AnsThis fall, I had three somewhat decrepit ash trees cut down. A friend with a chainsaw cut a cross section so I could count the rings. How far out do the countable rings go? Do I count the rings in ...

Science isn't always perfect, and decades ago, a graduate student's simple experiment proved that, though exactly why he did what he did remains a mystery.

We have a natural fascination with time – how landscapes have been carved over millennia, how our bodies grow and sag with age, how the stars traverse the sky each night. Scientists probe the layers ...