This week, genius Amanda Thibodeau talks about beneficial bacteria (aka probiotics): what they are, why to take them with antibiotics, and health claims made about their healing abilities.

In part one our series, Dr. Jeffrey Katz talks about sinusitis.  He tells us what sinuses are, what they do, and how they can wreak havoc when infected.  He explains why traditionally high doses of antibiotics are prescribed, and how they work treating sinusitis.