Researchers are studying whether Ginkgo biloba leaves might support weary leg veins and cut the risk of blood clots.

One reason is for camouflage; a giraffe's spots help it blend into its surroundings. The irregular markings break up the animal's outline, especially when sunlight filters through trees and shrubs.

When something is wrong inside the body, it doesn't always shout, though there might be signs that are easy to miss. The ...