Professor Knut Wittkowski, 3 april 2020. Foto: Journeyman Pictures

Professor Knut Wittkowski, 3 april 2020. Foto: Journeyman Pictures
http://www2.rockefeller.edu/ccts/rdbs
https://www.youtube.com/watch?v=lGC5sGdz4kg

Äldre patient på sjukhus. Foto: Shutterstock.com
Istider. Foto: Jeremy Bishop. Licens: Unsplash.com