or compound (three or more leaflets). This leaf structure is always a help with tree identification because of each tree species' leaf structure. On a simple leaf, the leaf blade is singly ...

Poison ivy, oak and sumac all can create itchy rashes from urushiol. What you need to know before the rash starts.

Scientists made fake leaves and dropped them in water tanks to observe how different shapes move as they sink.

"Data correlating shape and settling across a broad range of natural, mutated, and artificial leaves support the ...