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How Cells Work
science.howstuffworks.com/life/cellular-microscopic/cell.htm
The human body is composed of about 10 trillion cells. Everything from reproduction to infections to repairing a broken bone happens down at the cellular level. Find out all about cells.
What Happens If Your Adult Teeth Just Don't Come In?
There are several reasons that adult teeth might not come in. HowStuffWorks looks at different scenarios.
5 True Stories of Twins Separated at Birth
science.howstuffworks.com/life/genetic/5-true-stories-twins-separated-at-birth.htm
What happens when twins are reunited decades later? And how in the world can you explain separated twins giving their firstborn son or their family dog the same exact name?
10 Recent Breakthroughs in Marine Biology
animals.howstuffworks.com/animal-facts/10-recent-breakthroughs-in-marine-biology.htm
Marine biology breakthroughs have helped us learn about the ocean's residents. Explore 10 of the coolest marine biology discoveries.
10 Bizarre Medical Conditions
health.howstuffworks.com/diseases-conditions/rare/10-bizarre-medical-conditions.htm
Bizarre medical conditions have baffling symptoms and often no cure. Take a look at these 10 bizarre medical conditions that have and do occur.
How Kin Selection Works
science.howstuffworks.com/life/evolution/kin-selection.htm
We're used to taking the phrase "survival of the fittest" to mean it's an "every man for himself" world. But some animals (like worker bees) sacrifice themselves to ensure their species lives on. Why would they do this?
Ichthyosis Overview
health.howstuffworks.com/skin-care/problems/medical/ichthyosis.htm
The types of ichthyosis can range from everyday dry skin to more serious, fatal versions. What causes ichthyosis, and how can you treat it?
Why Do Most Humans Have 23 Pairs of Chromosomes?
science.howstuffworks.com/life/genetic/23-pairs-chromosomes.htm
Nearly every living cell is made of DNA, and every chromosome contains exactly one molecule of DNA. But not all cells are made of the same number of chromosomes.
How Evolution Works
science.howstuffworks.com/life/evolution/evolution.htm
Evolution is fascinating because it attempts to answer one of the most basic human questions: Where did life, and human beings, come from? The theory of evolution proposes that life and humans arose through a natural process.
Is Catnip Bad for Cats or Can Cat Brains Handle the Nip?
animals.howstuffworks.com/pets/is-catnip-bad-for-cats.htm
Most pet owners have asked themselves at some point: Is catnip bad for cats? The short answer is no. Catnip is nontoxic and safe for your cat in most situations, but there's more to this minty herb than meets the eye.