If you've gone green, I'll wager that you are pretty smart already. I'm not just saying that to win you over either. The climate crisis may be the greatest crisis the human species will ever have to deal with. If you are worried about global warming, then you must have some degree of foresight. And foresight is a sure sign of intelligence.

One popular green activity, the nature walk, can do more than strengthen those calf muscles. It can also nourish the old brain bin. You were going to take a walk anyway? I said that you were smart, remember?

According to researchers at the University of Michigan, taking a nature walk can sharpen the mind, but a walk around the city does not have the same effect.