Why is breathing so complex?

“What makes human breathing so complex?” This question showed up recently in my email box. I’m a volunteer responder on the website, Quora, an online question-answer site (of somewhat uneven quality). As a retired biomedical scientist, sharing...

Celestial Phenomena

The Great American Solar Eclipse Probably the last of my friends to post eclipse photos on Facebook, I had decided to take a social media break on August 21, “Eclipse Day.” When not viewing or thinking or writing about the sun, our distant, dangerous...