Amount of caffeine, a mood booster, needed to reduce your risk of suicide: 100 to 1,000 milligrams per day, or about one to seven cups of coffee.

Time it takes to make instant coffee: 30 Seconds.

Time marriage counselors recommend kissing your spouse every day: 20 Seconds.

Most annoying classroom sound, according to teachers: children chattering.

Second-most annoying: the scraping of chairs and desks.

Article of clothing most likely to lead to glaucoma: the necktie, because it increases blood pressure in the eyes.

Hours per week that American men spend with friends: 10

Hours per week that American women spend with friends: 7.5

Compiled by Jennifer Drapkin. Sources: Archives of Internal Medicine, Maxwell House, Love Signals by David Givens, Journal of Environmental Psychology, British Journal of Ophthalmology, The Gallup Organization