Slightly lost bumble bees use scent to find their way home

Put yourself in the exoskeleton of a bumble bee for a moment: Your world would be a riot of colors and scents, both essential to guide your search for pollen and nectar. Bumble bees have excellent vision: They have a pair of compound eyes that can distinguish UV and most colors except red, plus three additional simple eyes specialized in detecting polarized light. Their sense of smell dwarfs ours: Approximately 100 times more sensitive, and capable of sniffing out illegal drugs or explosives at airports, confirming pregnancy in women, or detecting cancers and diabetes in early-stage patients.