@e89610ab @7edccf3d - if all known transmissible cancers are this young, we either haven't looked hard enough or there must be some reason they "burn out" - which would be very interesting to understand. 

Theoretically there could be some reason *all* transmissible cancers have arisen only recently, but I can't believe that. 

 @b4c50e1b @7edccf3d Several recent papers discuss such interesting evolutionary questions. The senior author of the following article is Beata Ujvari, who's also quoted in Carl Zimmer's piece: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7327844/ 

 @e89610ab @7edccf3d - Thanks, I'll read it!