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