Yes, great, thanks. Got a magic sleeping charm you can lend me?

Bats have immune systems which are relatively under-reactive compared to us. They happily harbour all kinds of wild, nasty viruses that they don’t bother mounting a big immune response to.

My mom wouldn’t let me see the rod because of the NSFW tag. :(

Just about all hormones are made and stored in their own glands and released carefully in response to circulating chemical signals. One really unpleasant symptom cluster from cancers of hormone producing glands is indiscriminate outpouring of hormones by the now unregulated cancerous cells which are still well organized enough to produce hormones unchecked. This can happen with the thyroid, adrenals, pituitary, etc.

Oh 70’s TV, never change!

Brain injuries, which have been with us as long as we've been a species. An interesting and surprising exception is Aristotle, who basically thought the brain was a radiator.

Ah man, looks like 2023's not gonna be my year.

Excellent explanations elsewhere in the thread. For me, the 'Oh wow!' factoid is, the gas exchanging surface area in your lungs is the size of a tennis court. Remember that with each heartbeat, just as much blood gets pumped to your lungs (from the right ventricle) as to the rest of your body (from your left ventricle), so there's a whole lotta blood being pumped through a network spreading it as thin as a single red blood cell, over a freakin' tennis court!