Dementia and Ultra-processed Foods.

 Eating too many ultra-processed foods can lead to cognitive decline and dementia.

Reversing Heart Disease and Alzheimer's

 This doctor can reverse heart disease through diet and exercise. He is working on reversing Alzheimer's the same way.

 The World's Countries' GDPs in one chart.

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