FLU SEASON: Can exercise help stave off illness? Changes to the seasonal flu vaccine, bacterial surprises, and better ways to purify water in developing countries. Also: did life originate between mica sheets?
SUNSCREEN & SUPPLEMENTS: Sunscreens from ivy, why tanning oil speeds up skin damage, and when to apply sunscreen. Also: the link between fructose and pancreatic cancer, and over-the-counter weight-loss supplements fail the grade.