As long as experiencing your optimal level of good stress doesn't damage others, it's hard to objectively define where normal enjoyment of stimulation becomes adrenaline junkiehood.

We're getting along so well; I trust you so much for this one second that I'm going to let you yank on me.

The purpose of science is not to cure us of our sense of mystery and wonder, but to constantly reinvent and reinvigorate it.

Oxytocin is lauded for how it promotes warmth, generosity, social bonding, cooperation, trust, and compassion.

The frontal cortex doesn't even fully develop until age 25, which is wild!

...when doing science (or perhaps when doing anything at all in a society as judgmental as our own), be very careful and very certain before pronouncing something to be a norm - because at that instant, you have made it supremely difficult to ever again look objectively at an exception to that supposed norm.

Importantly, rather than promoting aggression, testosterone promotes whatever is needed to maintain status when challenged.