How did dogs get to be dogs? What do our four legged friends dream about? And - most importantly - are dogs really smiling at us when we think they are? All these questions (and a whole lot more)are answered by our intrepid science reporters, Jeanna and Mindy.
Below you can find links to further reading on the topics discussed in this episode.
Mystery #1: How Did Dogs Get to Be Dogs? (https://www.livescience.com/8405-dogs-dogs.html)
Dogs diverged from wolves — Canis lupus — at least 20,000 and perhaps as long as 40,000 years ago
A 14,700-year-old jawbone is the oldest undisputed fossil from a domesticated dog (Canis lupus familiaris)
Mystery #2: What Do Dogs Dream About? (https://www.livescience.com/53743-dog-dreams.html)
In 1977, scientists studied 6 pointer dogs, studied electrical brain activity for 24 hours: They spent 44% of time awake; 21% drowsy; 12% in REM sleep; and 23% in the deepest stage of non-REM sleep (slow-wave sleep).
For whatever reason, the size of the dog may determine the size of the dream. Smaller dogs have more frequent but shorter dream periods; large dogs have less frequent but longer dreams.
Guest editor report with Rafi Letzer: Tibetan Mastiffs Bred with Mountain Wolves to Survive at Super-High Altitudes (https://www.livescience.com/tibetan-mastiff-wolf-genes.html)
Mystery #3: Are Dogs Really Smiling at Us? (https://www.livescience.com/65506-are-dogs-smiling.html)
We have a special bond with our dogs and when humans and dogs stare into each other's eyes, both experience a rise in levels of oxytocin
Very few other animals in the world actually make eye contact with humans
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Music by Chad Crouch - Algorithms
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