Your college roomate, Teresa, has confided in you that she d…

Your college roomate, Teresa, has confided in you that she developed diarrhea after taking antibiotics for a few days to treat an upper respiratory tract infection. She still has a week to go on the antibiotics. To try to cure her diarrhea, she started eating active-culture yogurt, which in the past has helped her “cure” occasional episodes of diarrhea. Explain why she has diarrhea and why the yogurt isn’t working this time.

In a prestigious school of wizardry and witchcraft, a studen…

In a prestigious school of wizardry and witchcraft, a student can brew 12 polyjuice potions in an hour or 15 Amortentia potions per hour. If Professor Snape wishes for there to be an equal number of Amortentia potions and polyjuice potions, what is the fewest number of students he could assign to brew each type?

Iron is an important mineral for everybody, and iron deficie…

Iron is an important mineral for everybody, and iron deficiency is the most common nutrient deficiency worldwide (including in the U.S.). Explain how iron is involved in physiological processes necessary for sport and exercise, and in what situations an athlete might need a little more iron?