Guard bees inspect chemical cues to determine whether "drifter" honeybees can enter a hive.
What does a tropical honeybee have to do with evaluating the merit of a theory as to how dinosaurs became extinct? Learn more on this Moment of Science.
Honeybees make propolis by collecting the secretions of trees and other plants where they live; thus the make-up of propolis varies depending on the plant life around. Researchers have found the propolis of Brazilian honeybees to be particularly potent when it comes to protecting teeth.