Baby snow monkey enjoying the neighborhood hot springs

---

References:

Event	Years Ago (YA)	Source
Universe appears	13,700,000,000	https://en.wikipedia.org/wiki/Age_of_the_universe
Earth forms	4,500,000,000	https://en.wikipedia.org/wiki/Life#Origin
Life appears	3,500,000,000	https://en.wikipedia.org/wiki/Life#Origin
Mammals appear	250,000,000	https://en.wikipedia.org/wiki/Mammal#Origins
Hominins	2,000,000	https://en.wikipedia.org/wiki/Homo
Japanese Macaques diverge	500,000	Mol Phylogenet Evol. 2004 Mar;30(3):676-85. doi: 10.1016/S1055-7903(03)00247-1. PMID: 15012947.
Anatomically Modern Humans	250,000	https://en.wikipedia.org/wiki/Early_modern_human
Behaviorally Modern Humans	50,000	https://en.wikipedia.org/wiki/Behavioral_modernity
Written history	5000	https://en.wikipedia.org/wiki/Recorded_history
Greeks invent hot showers	2500	https://web.archive.org/web/20080509052435/http://www.inventions.org/culture/ancient/showers.html
London gets running water	409	https://www.museumofthehome.org.uk/explore/stories-of-home/a-brief-history-of-running-water/#:~:text=In%20modern%20Britain%20we’re,the%20wealthiest%20sections%20of%20society.
Most of US has running water	100	https://www.visualcapitalist.com/rising-speed-technological-adoption/
Most of world has “improved” water	60	https://ourworldindata.org/water-access