Female Orchestra Conductor Holding Baton
Wanna learn about the suprachiasmatic nucleus (SCN)? It’s in our brains and it’s the conductor of the circadian rhythm. AndreyPopov/Getty Images/iStockphoto

The tick-tock of our circadian clock

Our bodies are filled with tiny clocks. Down to the cellular level, they tick and tock and stay in sync with the light and dark cycles of the sun. These near 24-hour-cycles are known as our circadian rhythm.

In this episode, we’ll take a look at the suprachiasmatic nucleus — the great conductor of our circadian rhythm. Do you want to know the best time of day to be productive or exercise or do your homework? Find out as we follow our pal Bob around for a day. Plus, the number of screens we look at every day keeps growing. Find out how light from these screens might affect circadian rhythms and what you can do about it.

What if every 24 hours, you saw the sun rise and set 16 times? That’s what happens to astronauts orbiting the earth. Doug Wheelock gives a first-hand account.

Throughout history, cycles of light and dark have been celebrated, revered and commemorated. Archeoastronomer Anthony Aveni guides us through a few of these events. All that plus a listener-submitted Mystery Sound from down under.

This episode is the first of a two-parter looking at circadian rhythm. The second part will look at how these cycles affect plants and animals too!