I know I am linking this guy a bunch, but his research fascinates me a lot. From scuba diving to Alzheimer's. Some amazing cutting edge stuff.
https://m.youtube.com/watch?v=6Bf9UoTokvg

Edit: Bonus - another one I am listening to now. Much of the same stuff with some nuance depending on what the subject of the day is or what current research says. This one is only 12 minutes long.

https://www.youtube.com/watch?v=dxWUGuTV0JY