Using your hands = mental vitamins

This is very interesting. It might explain why once I get started on a crochet project, I feel a certain compulsion to keep going. From the Ladies Home Journal (yes, such a thing still exists! - the whole article is quite fascinating) via Austin Kleon:

When you do meaningful work with your hands, a kind of neurochemical feedback floods your brain with dopamine and serotonin. These happy brain chemicals are natural antidepressants, and we’ve evolved to release them both to reward ourselves for working with our hands and to motivate ourselves to do it some more.