Your Paw-some Question | Do goldfish need 8-12 hours of light?

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Cosmo and I learn that a goldfish's circadian rhythm is tuned by light—and by feeding schedule, thanks to our friend Dr. Nora Hickey

• Find out more about the circadian rhythm
• Read up on the one-eyed worm ancestor that gave you your pineal gland
• Want to see what the see-through pineal window in a fish's skull looks like—when scientists make it glow? Here's a paper about it (go to figure 1)
• Check out how zebrafish help researchers unravel hearing
• And discover the (intense) salmon life cycle

Sound effects courtesy Pixabay

 As always, submit burning questions at askdruniverse.wsu.edu.  Who knows where your questions will take us next.