My car is completely dented from falling hickory nuts. It's amazing the force with which they fall. I remember a neighbor explaining that not all hickory trees' nuts are edible, and some produce edible nuts only every other year. I'll do a little investigating.
Buckeyes, on the other hand, are poisonous: Buckeyes are killer nuts.
"In all our woods there is not a tree so hard to kill as the buckeye. The deepest girdling does not deaden it, and even after it is cut down and worked up into the side of a cabin it will send out young branches, denoting to all the world that Buckeyes are not easily conquered, and could with difficulty be destroyed." - Daniel Drake, 1833