Cost of Living vs Purchasing Power on Earth

 Here is a plot of the cost of living vs purchasing power for 500 cities in the World.

 America has one of the smallest numbers of doctors per capita in the world.

Before electricity, people used to sleep twice during the night

 Before electricity, people used to sleep in two installments, with a break of about two hours between them:

https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep?utm_source=pocket-newtab

 Evidence of evolution in humans: more and more of humans have an extra artery in their arms.

https://www.sciencealert.com/more-humans-are-growing-an-extra-artery-in-our-arms-because-we-re-still-evolving

Clear chart why electric vehicles are better for the environment than hydrogen vehicles or internal combustion vehicles.

 Blood pressure drug has potential to extend lifespan.

 More evidence humans are still evolving: many babies are being born without wisdom teeth, with an extra artery in their arm, or with smaller jaws and shorter faces.