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thought this article was interesting:

Want to be happier? Try making your life a little harder. Use a push mower. Bake your own bread. Knit a new scarf. Do things by hand and your brain will thank you.” Dr. Kelly Lambert, a neuroscientist is quoted in the article as saying “When you do meaninfgul work with your hands, a kind of neurochemical feedback floods your brain with dopamine and seratonin. These happy brain chemicals are natural antidepressants.