There's no question that a dog tilting its head is one of the cutest things possible, but why do they do it?

Hank explains speciation - the evolutionary process by which new biological species arise - in terms of finches, ligers, mules, and dogs.

Nick Jenkins talks with Hank Green about selective breeding, with special guest Jessi Knudsen Castañeda.

The video highlights the special bond between humans and dogs, showcasing their role as loyal companions and hardworking helpers throughout history. The video celebrates the intelligence, loyalty, and playfulness of dogs, highlighting...