汉斯·罗斯林：200 个国家、200 年、4 分钟——统计之乐（BBC）

Hans Rosling uses augmented-reality animation to show 200 countries over 200 years in four minutes, built from 120,000 data points. It tracks life expectancy and income to show the world's development.

Why HN likes it: HN commenters send it as a short antidote to cynicism, showing long-term global progress and the shrinking gap between rich and poor countries.

“Spend five minutes and watch this. Amazing presentation my Hans Rausling”