China has or had a desertification problem because the communist government decided to use cloud seeding to control weather patterns, but they didn't actually know what they were doing, so large areas of the country turned to desert because they were no longer getting their natural amount of rain.

Sounds like 12 Angry Men was a lot closer to reality than one might think, except the one guy who thought he was innocent managed to convince the other 11 who voted guilty.

Because those are the kinds of doctors that most people personally know and interact with. Not everyone has met someone who is a doctor of literature or engineering or physics, etc., but from infancy everyone sees a medical doctor a few times a year. There might be more PhD's than MD's, but they don't tend to work with the general population quite as much as MD's.

All STDs could theoretically be extinct within a generation or two if people would stop having sex with multiple partners. If each person only ever had sex with one partner their whole life, then there would be no spread of disease, any viral diseases would be confined to family lines. Of course, getting every person on the planet, or even in a small town, to agree to that would be impossible.

That's more a function of their breed than their feed. Specific breeds produce the different shell colors, such as Americanas, Araucanas and mixed breed Easter Eggers. I used to raise chickens as a hobby, my Americana hen was the only one of them to lay green eggs. All of them got the same feed and foraged in the yard eating bugs and various plants. There was an effect on the clearness of the whites and the color of the yolks, the yolks having a darker orange color, possibly from pigments from their foraging.

Interestingly enough, it seems that the egg color gene is passed by the rooster rather than the hen, because none of the daughters of my Americana hen ever laid any green eggs. That, or the brown egg color gene is just more dominant.