World Down Syndrome Day
3/21 — for the third copy of chromosome 21. People wear mismatched socks because chromosomes look like socks. The pun is the awareness campaign.
- Category
- Awareness
- Observed in
Switzerlandofficial
Also on this day
Full history →Notable · 2019
A major explosion at a chemical plant in Yancheng, China, killed 78 people and injured 640 others.