Week 2 Discussion 1
13-year-old Jason has a bad case of facial acne. According to his older sister, his skin problems are from too much late-night computer games, frozen pizza, and cheddar popcorn.
Explain the real cause of acne to his sister.
Week 2 topic 2
Elena developed chicken pox when she was in first grade. Later in life, when her children developed chickenpox, she remained healthy even though she was exposed to countless virus particles daily.
Explain why?
