Biodiversity and Conservation Why are catfish bad neighbors for allis shad? Scientists wanted to find out if the introduced European catfish are a threat to the endangered allis shad.
Pollution How can poop be cleaned and reused? Researchers wanted to find out if they could build a low-cost wastewater treatment option using only materials found locally in Madagascar.
Social Science How can we help extremely poor people earn more money? Researchers conducted a study in six different countries to find out if providing extremely poor people with livelihoods and food support could enable them to escape extreme poverty.