The Worst...

1) The worst stall to pick in a public restroom...

The middle one. The center stall has more bacteria than those on either end.

2) The worst place to sit on an airplane...

The rear. Avoid this section if you're prone to airsickness. The farther from the center you are, the more up-and-down movement you experience. Because the tail of the plane tends to be longer than the front, that's the bumpiest of all. The smoothest option is sitting as close to the wing as you can.

3) The worst place to store medicine...

The medicine cabinet. It's not uncommon for the temp in a steamy bathroom to reach 100F--well above the recommended storage temperatures for many common drugs. To stay out of the red zone, store your meds in a cool, dry place, such as the pantry.

4) The worst place to set your handbag/purse...

The kitchen counter. Your fancy handbag is a major tote for microbes: Research swabs showed up to 10,000 bacteria per square inch on purse bottoms--and a third of the bags tested positive for fecal bacteria! A woman's carryall gets parked in some nasty spots: on the floor of the bus, beneath the restaurant table--even on the floor of a public bathroom. Put your bag in a drawer or on a chair, --anywhere except where food is prepared or eaten.

5) The worst place to use headphones/earbuds...

On an airplane, train, or subway. Sure, music's a better traveling companion than your seatmate's cell phone conversation. But studies show that if you listen through a headset in a noisy environment, you probably crank the volume too high. Harvard researchers found that in reasonably quiet surroundings, volunteers tended to keep the volume at an ear-friendly level. But when the researchers added background noise--the loud rumble of an airplane cabin--80% boosted the volume as high as 89 decibels, a level that risks long-term hearing damage. If you must have music, consider noise-canceling headphones--only 20% of listeners in the study who used a set got close to the danger zone.
As an audiology student, this is my personal favorite - because it's true! iPods can cause noise damage to your ear, but hey, I guess it secures my future right? :)

6) The worst spot for your television...

Wherever you eat. Studies show that distraction is your waistline's enemy--it can keep you from noticing how much you're eating. The best place for your television: up or down a flight of stairs, so you have to "work" to get a snack--you'll be much less likely to munch.