As a kid, Scott Fletcher was the go-to guy to identify whatever strange-looking critters had appeared in his neighbors’ yards. When his father, a geology professor, took him and his brothers out for weekend fossil hunts in central Pennsylvania, Fletcher went searching for insects while the other two checked out the rocks. His father helped him assemble a sort of homemade natural history museum in the basement. He kept salamanders in a crate inside the house — until the smell overwhelmed his family and his dad shut-it down.