1000年前のチョコレートカップ@北米 three cylindrical vase fragments, dated to between 1000 and 1125 C.E., all tested positive for theobromine--the telltale chemical of cacao. That places chocolate in North America before the arrival of European colonists
Physiological recordings from Johnston’s organ (the mosquito’s "ear") reveal sensitivity up to 2000 Hz, consistent with our observed courtship behavior. These findings revise widely accepted limits of acoustic behavior in mosquitoes.