A leap day comes once every four years -- a moment outside the ordinary, an extra page in the calendar where possibilities stretch a little further.

Each year Forbes ranks the world based on a variety of categories ranging from the wealthiest people on the planet to the best colleges America has to offer.

Background and Methods: Schistosomiasis is debilitating and reported to impair immune responsiveness of infected hosts. In Cameroon, mass drug administration (MDA) is used in schoolchildren to reduce ...