Slightly creepy experiment with ants shows that drugs can permanently alter behavior

Carpenter ants live in a caste system, where some members of the colony grow into large, strong worker guards known as majors and others grow into small, inquisitive food scouts known as minors. Scientists have long been fascinated by how majors and minors come to be. Though the two castes share the exact same genomes (and parents), they look and behave in dramatically different ways. Clearly, these differences must be epigenetic, or triggered by environmental factors that take hold after the ants are born.