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Petrified Wood: A Journey From Tree to Stone
science.howstuffworks.com/environmental/earth/geology/petrified-wood.htm
Petrified wood can be found all over the world, but how is it created?
Peyote Is Endangered, Spiritually Sacred and Becoming Legal
science.howstuffworks.com/peyote.htm
Long-banned in the U.S., except for religious purposes, peyote is starting to be decriminalized in some cities. But is that a good thing for this endangered plant?
Physicists Make a Splash With a Urinal That Doesn't
science.howstuffworks.com/splashless-urinal.htm
Splish-splash is not the sound you want to hear when you're standing in front of a urinal. A new design is being touted as the answer to the splashless pee.
Pink Quartz Meaning: A Look at the Real Love Stone
science.howstuffworks.com/environmental/earth/geology/rose-quartz.htm
This beautiful pink quartz is found in numerous places throughout the world and is thought to be associated with unconditional love.
Pizza Nightmares: Can Your Diet Determine Your Dreams?
Folklore says heavy or spicy food before bedtime can cause nightmares. Surprisingly, there's been no real study of this - until now.
Planet Mercury: Fast, Pockmarked and Shrinking
science.howstuffworks.com/46004-mercury-explained.htm
Mercury is the closest planet to the sun, and it's the smallest in the solar system. So why does it have longer days than we have on Earth?
Planetarium
science.howstuffworks.com/dictionary/astronomy-terms/planetarium-info.htm
Planetarium, is an educational device for showing the locations and movements of the planets and other objects in the universe.
Planetesimal Hypothesis
science.howstuffworks.com/dictionary/astronomy-terms/planetesimal-hypothesis-info.htm
Planetesimal hypothesis is a theory of the origin of the solar system. It was proposed by Forrest R.
Plants Can Defend Themselves by Making Caterpillars Turn Cannibal
science.howstuffworks.com/life/botany/tomato-plant-defense-caterpillar-cannibal.htm
How can plants defend themselves against insects? Learn more about a new tomato study in this HowStuffWorks article.
Plastic Numbers: Breaking Down Recycling Codes
science.howstuffworks.com/environmental/green-tech/sustainable/question217.htm
There are seven different numbers you might see on a plastic container. And each number has its own meaning.