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What is a birthmark?

health.howstuffworks.com/skin-care/problems/baby/question628.htm

I noticed a light brown spot emerge on my newborn son's forehead when he was about three days old. It never went away. Everyone calls it a birthmark. What is a birthmark?

How Do Oysters Make Pearls?

animals.howstuffworks.com/marine-life/question630.htm

How do oysters make pearls, and what is the difference between natural and cultured pearls?

How Does an Optical Mouse Work?

computer.howstuffworks.com/question631.htm

How do optical mice work? Take a look at the technology that goes into optical mice and see what makes optical mice work.

How does a rebreather work?

science.howstuffworks.com/question632.htm

Unlike a regular SCUBA regulator which creates bubbles when the person wearing the apparatus exhales, a rebreather produces no bubbles when someone exhales. What exactly is a rebreather and how does it work?

Who Came Up with Mother's Day and Why?

people.howstuffworks.com/culture-traditions/holidays-other/question634.htm

Mother's Day is set aside in many countries as a day to honor our mothers and grandmothers. The origin of this day can be traced back much farther than you might think. Learn about the history of this special day.

Why are barns usually painted red?

home.howstuffworks.com/question635.htm

Red barns are a common sight in rural parts of the country, but have you ever wondered why they're painted red? Learn about the purpose of red barns.

Why is there a bulge in the exhaust pipe of my dirt bike?

auto.howstuffworks.com/question636.htm

I have a dirt bike, and the exhaust pipe has this big bulge in it near the engine. What is the bulge for?

What is sunburn?

health.howstuffworks.com/skin-care/beauty/sun-care/question637.htm

What is sunburn? Why does my skin turn red, and why is it so painful? Learn the basics of sunburns at HowStuffWorks.

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