She watched how well the ants took care of the young of the colony, recording how often each and attended to, carried and fed them. She compared how well 20 – old – ants and 95 – day - old ants followed the telltale scent that the insects usually leave to mark a trail to food.  She tested how ants responded to light and also measured how active they were by counting how often ants in a small dish walked across a line. And she experimented with how ants react to live prey: a tethered fruit fly. Giraldo expected the older ants to perform poorly in all these tasks. But the elderly insects were all good caretakers and trail-followers: the 95-day-old ants could track the scent even longer than their younger counterparts. They all responded to light well, and the older ants were more active. And when it came to reacting to prey, the older ants attacked the poor fruit fly just as aggressively as the young ones did, flaring their mandibles or pulling at the fly’s legs.

colony – telltale – scent – insects – mark – trail – prey – caretaker – follower – track 

 attack – aggressively - flaring – mandibles

While many diseases that affect humans have been eradicated due to improvement in vaccination and availability of health care, there are still areas around the world where certain health issues are more prevalent. In a world that is far more globalist that ever before, people come into contact with one another through travel and living closer to each other. As a result, super viruses and other infections resistant to antibiotics are becoming more and more common.

Geography can often play a very large role in the health concerns of certain population. For instance, depending on where you live, you will not have the same health concerns as someone who lives in a different geographical region. Perhaps one of the most obvious examples of this idea is malaria prone areas which are tropical regions that foster warm and damp environment in which the mosquitoes that can give people these diseases can grow. Malaria is much less of a problem in high altitudes, deserts, for instance.