Time is an elusive concept: We all experience it, and yet, the challenge of defining it has tested philosophers and scientists for millennia. It wasn’t until Albert Einstein that we developed a more ...

The geological time scale, established by scientists in the mid-19th century and agreed upon internationally, breaks down the eternity of our planet's history into more manageable units than years.

St. Augustine said of time, “If no one asks me, I know what it is. If I wish to explain to him who asks, I don’t know.” Time is an elusive concept: We all experience it, and yet, the challenge of ...