Do the summer and winter solstices mark the beginning of the warmest and coldest quarters of the year? After an introduction of scientific concepts related to seasons, an informative video explains how the Romans are responsible for...

How do we define a year? Science has multiple definitions depending on if you use a sidereal year, a tropical year, or an anomalous year. A helpful resource explains all three, as well as how the human body changes over the course of the...