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