[…]

Sources:
Tear Ducts
Paper: https://www.cell.com/cell-stem-cell/f…​
Press release 1: https://www.eurekalert.org/emb_releas…​
Press release 2: https://www.eurekalert.org/emb_releas…​
Sjogren’s: https://www.sjogrens.org/understandin…​ ogren

Eye Color
Original paper: https://advances.sciencemag.org/conte…​
Press release: https://www.eurekalert.org/pub_releas…​
Mendelian trait: https://www.nature.com/articles/jhg20…​

Image Sources:
https://www.cell.com/cell-stem-cell/f…​
https://www.eurekalert.org/pub_releas…​
https://commons.wikimedia.org/wiki/Fi…​
https://www.nature.com/articles/s4146…​
https://www.eurekalert.org/multimedia…​
https://www.eurekalert.org/multimedia…​
https://www.nasa.gov/mission_pages/st…​
https://commons.wikimedia.org/wiki/Fi…​
https://commons.wikimedia.org/wiki/Fi…​
https://commons.wikimedia.org/wiki/Fi…​
https://commons.wikimedia.org/wiki/Fi…​