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