A heuristic for happiness/contentment/good disposition: You are not upset to hear that someone you know has been owning bitcoin since 2011. - Nassim Nicholas Taleb

Organisms need, to use the metaphor of Marcus Aurelius, to turn obstacles into fuel just as fire does.

If someone pays you for anything other than a specific transaction, you are a slave.

And, talking about radiation, few wonder why, after hundreds of million of years of having our skins exposed to sun rays, we suddenly need so much protection from them — is it that our exposure is more harmful than before because of changes in the atmosphere, or populations living in an environment mismatching the pigmentation of their skin — or rather, that makers of sun protection products need to make some profits?