Yes it was noticed that those who tended cows would get a minor infection called “cow pox” and that they were somehow immune to the more deadly chicken pox.
The Curies found radium in pitchblende.
Charles Darwin was 22 when he studied the beaks of the various finches and learned they had all come from one species that had immigrated to the island. Adaptive radiation.
Yes it was noticed that those who tended cows would get a minor infection called “cow pox” and that they were somehow immune to the more deadly chicken pox.
The Curies found radium in pitchblende.
Charles Darwin was 22 when he studied the beaks of the various finches and learned they had all come from one species that had immigrated to the island. Adaptive radiation.