(no subject)
Dec. 25th, 2018 01:16 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
timeletsLet's say, I wake up with a splitting headache that makes it practically impossible for me to take even a brief look at a computer screen. Then, I get on a bike and ride outside for fifteen minutes. And the headache is gone!
Why is that?
Why is that?
