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What can your spit tell you about your DNA?
science.howstuffworks.com/life/genetic/spit-dna.htm
Doctors always want your blood, but one day, a health care professional may ask you to open up and say, "Ptooey!" Why? Your spit holds a mother lode of biological information.
How Spiders Work
animals.howstuffworks.com/arachnids/spider.htm
Spiders are some of the most successful carnivores in history. Learn how spiders build webs and attack prey and examine cool spider species like jumping spiders.
5 Ways Stress Can Affect a Pregnancy
Stress can affect a pregnancy more than you might think. See five ways that stress affects pregnancy here to learn more and have a healthier pregnancy.
Truffles: The Rarest and Most Expensive Fungi in the World
recipes.howstuffworks.com/truffles.htm
Truffles are the rarest and most expensive fungi in the world. HowStuffWorks looks at the competitive business behind the truffle.
Dog Parks Guide
animals.howstuffworks.com/pets/pet-travel/dog-parks.htm
Dog parks are as diverse as the breeds that use them. Learn all about dog parks in this article from Animal Planet.
How Sword Swallowing Works
entertainment.howstuffworks.com/arts/circus-arts/sword-swallowing.htm
Sword swallowing is an extremely dangerous trick that does not involve illusions. Learn about sword swallowing and the dangers of sword swallowing.
Do you know where in the world you can find these famous statues?
play.howstuffworks.com/quiz/do-you-know-where-the-world-you-can-find-these-famous-statues-learn
Of the thousands of remarkable statues around the world, you may know where to find the Statue of Liberty, and maybe the Sphinx. But what about all the others? From The Thinker and Venus de Milo to the Olmec Colossal Heads and Moai, see if you can match the famous statue to where in the world you'd find it.
How Nurse Sharks Work
animals.howstuffworks.com/fish/sharks/nurse-shark.htm
Nurse sharks are mellow, sluggish sharks that hover above the ocean floor. See why nurse sharks don't have that much in common with great whites.
How Snakes Work
animals.howstuffworks.com/snakes/snake.htm
Snakes are one of the world's most feared animals. Learn how snakes get around, how they kill and eat their prey, and how they court and reproduce.
How Your Heart Works
health.howstuffworks.com/human-body/systems/circulatory/heart.htm
The heart is a vital organ that basically serves as a pump. Learn about heart chambers and valves, blood flow, heart's electrical system and blood supply.