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What Is Citric Acid, and Is It Safe?
recipes.howstuffworks.com/food-science/citric-acid.htm
HowStuffWorks finds out what citric acid is, how it is made and whether or not it is safe.
Sea Urchins Are the Edible Pincushions of the Ocean
animals.howstuffworks.com/marine-life/sea-urchin.htm
Sea urchins look like spiny pincushions and are considered a delicacy to foodies everywhere. HowStuffWorks gets to know the sea urchin.
How Chopsticks Became the Staple Utensil of Asia
recipes.howstuffworks.com/chopsticks.htm
Chopsticks have been in use since 1200 B.C.E. And today 20 percent of the world's population use the utensil. HowStuffWorks looks at its history.
The Blue-tongued Skink Has a Heart of Gold
animals.howstuffworks.com/animal-facts/blue-tongued-skink.htm
These intelligent, friendly creatures have a life span of 15 to 20 years and make great pets.
Cinnabar: Red, Beautiful — and Toxic
science.howstuffworks.com/environmental/earth/geology/cinnabar.htm
Cinnabar's bright-red pigment has been used in jewelry, pottery and makeup for millennia. But cinnabar is also the primary ore for mercury, making it a dangerous mineral if the particles are inhaled.
The Shocking Story of Lina Medina, Who Gave Birth at Age 5
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/lina-medina.htm
The world's youngest mother, Lina Medina, gave birth to a healthy baby boy at age 5 in 1939. But how could that happen?
How the CPR Doll Developed From a Famous Parisian Death Mask
history.howstuffworks.com/european-history/cpr-doll-history.htm
CPR Annie has been called "the most-kissed face in the world." But the doll's look was improbably inspired by a famous Parisian death mask.
How Long Would You Have Survived in the Stone Age?
play.howstuffworks.com/quiz/how-long-would-you-have-survived-in-the-stone-age
Many find it challenging to imagine life without smartphones and internet access. What about a world without electricity or running water, though? Find out how long you'd survive in the Stone Age when you take the following quiz!
Nature Craft Projects for Kids
lifestyle.howstuffworks.com/crafts/nature-crafts/nature-craft-projects-for-kids.htm
Nature craft projects for kids are fun, and kids will learn a lot too! Learn to do all sorts of nature craft projects for kids at HowStuffWorks.
How Pregnancy Works
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/pregnancy.htm
Pregnancy revolves around the goal of turning a mass of cells into a baby. Explore each trimester of pregnancy and learn about pregnancy issues, from c-sections to amniocentesis.