mountain tops
jungles
oceans
your back yard
everywhere
Willow
Artemisia Annua
Curare
Cranberry
plants
herbs
lichens
all of these are studied by botanists
Dandelion
Trial and error
Local doctor
Watching animals
100
200
300
400
20
40
60
80
Sweet Annie
Aspirin
Willow Bark
Both of these.
Neither of these.
25
50
75