Presents a variety of common sayings about your health and body and explains which are fact and which are fable.

Can you catch a cold if you go outside with wet hair? --Do humans really use only 10 percent of their brains? -- Can you harm your eyes by reading in the dark? -- Can eating junk food give you acne? -- Do carrots improve your vision? -- Can eating chicken soup cure a cold? -- Should you really wait a half hour after eating before you swim? -- Is yawning contagious? -- When you drop food on the floor, is it safe to eat it if you pick it up in five seconds? -- Do we really need to drink eight glasses of water a day? -- Can you cure nighttime leg cramps by sleeping with a bar of soap? -- Does an apple a day keep the doctor away? -- Can listening to loud music cause hearing loss? -- Can you hurt your knuckles if you crack them too much? -- If you cross your eyes, will they stay that way? -- Can eating fish make you smarter? -- Does eating spinach give you big muscles?