ADVERTISEMENTJonkel studied all kinds of North American bears, from polar bears in the Arctic to ghost populations of grizzlies in northern Mexico. However, I suspect that Jonkel’s greatest contribution can be found in a little can that weighs about 16 ounces: Bear pepper spray. Moses notes that, a couple decades ago, two or three visitors were mauled by grizzly bears every hiking season in Glacier National Park. Grizzly bears are highly intelligent, and cubs learn life lessons from their mothers. It’s called the Bearosol holster, and if we lived in a state with grizzly bears, we’d absolutely have one of these on our handlebars.