• A person burns seven percent more calories if he or she walks on hard dirt than pavement.

• A woman’s sense of smell is most sensitive during ovulation.

• About 400 different kinds of microbes live on and in the human body.

• About half of all Americans are on a diet on any given day.

• Banging your head against a wall burns 150 calories per hour.

• Flu shots only work about 70 percent of the time.

• In an average lifetime a person inhales about 44 pounds of dust.