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10 Greenhouses Around the World
home.howstuffworks.com/gardening/garden-design/10-greenhouses-around-the-world.htm
Greenhouses around the world great the ideal growing solution anywhere. Check out these top 10 greenhouses around the world.
What is pollen?
health.howstuffworks.com/diseases-conditions/allergies/outdoor-allergies/what-is-pollen.htm
Pollen, a fine powder, is the sperm that flowers use to reproduce. Learn what pollen is in this article.
How are frequency and wavelength of light related?
science.howstuffworks.com/dictionary/physics-terms/frequency-wavelength-light.htm
Frequency has to do with wave speed and wavelength is a measurement of a wave's span. Learn how frequency and wavelength of light are related in this article.
How Hearing Works
health.howstuffworks.com/mental-health/human-nature/perception/hearing.htm
Hearing is made possible through physical movement, rather than chemical reactions. Learn about hearing and see diagrams explaining the hearing process.
How a Concierge Works
people.howstuffworks.com/concierge.htm
Concierges can solve many problems and handle difficult tasks with surprising alacrity. Learn the difference between hotel concierges and personal concierges.
How is volcanic ash made?
science.howstuffworks.com/nature/natural-disasters/volcanic-ash.htm
Volcanic ash is what's left after a volcano literally blows its top. Learn how volcanic ash can devastate everything under its gray blanket.
10 Tips for Semi-pro Football Tryouts
entertainment.howstuffworks.com/sports/club-intramural/10-tips-for-semi-pro-football-tryouts.htm
Semi-pro football tryouts can be nerve-wracking experience for the football enthusiast. Learn 10 tips for semi-pro football tryouts at HowStuffWorks.
Hypersonic Speed Explained: How Hypersonic Planes Work
science.howstuffworks.com/transport/flight/modern/hypersonic-plane.htm
Higher, farther, faster: NASA's X-43A plane is destined to set new speed records. What sets the X-43A apart from other rocket-powered aircraft is that it is powered by a scramjet engine. Learn all about it.
Top 5 Retirement Activities for Men
health.howstuffworks.com/wellness/aging/retirement/5-retirement-activities-for-men.htm
These retirement activities for men provide ideas on fun and beneficial things to do in the senior years. See five retirement activities for men to get started.
Top 5 George Westinghouse Inventions
science.howstuffworks.com/innovation/famous-inventors/5-george-westinghouse-inventions.htm
You may not know who George Westinghouse is, but you know his name. It's adorned everything from televisions to light bulbs. Young science buffs may have entered the competition that once bore his name. Here are five of Westinghouse's inventions.