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Why do cougars scream?
animals.howstuffworks.com/mammals/cougar-scream.htm
Cougars scream during mating season to attract the opposite sex. Learn how cougars scream and why humans don't hear these cougar screams too often.
Why Is the Sky Blue?
science.howstuffworks.com/nature/climate-weather/atmospheric/sky.htm
We've all probably looked up and wondered why the sky is blue instead of, say, brown. The sky is blue because of the way Earth's atmosphere scatters light from the sun.
How Towing Safety Cables Work
auto.howstuffworks.com/auto-parts/towing/equipment/protective-towing/towing-safety-cables.htm
Towing safety cables act as a backup system in case something goes wrong. Learn why towing safety cables are so important at HowStuffWorks.
Who is looking to reinvent the 18-wheeler?
auto.howstuffworks.com/under-the-hood/trends-innovations/reinvent-18-wheeler.htm
An 18-wheeler reinvention is long overdue: Rising costs of fuel have led to trucker strikes and decreased profits. Read about one 18-wheeler reinvention.
Why Do Kangaroos Hop?
animals.howstuffworks.com/mammals/kangaroo-hopping.htm
Kangaroos hop with the help of powerful toes and springy tendons. Learn how kangaroos hop across terrain, and if they're physically able to walk.
Which is greener, bagging your grass or leaving your clippings there?
home.howstuffworks.com/mulch-vs-bag-grass.htm
Bagging your grass is not a bright idea. All you're doing it filling landfills. Learn why bagging your grass is harmful for the environment.
How Tape Recorders Work
electronics.howstuffworks.com/gadgets/audio-music/cassette.htm
Magnetic recording is the backbone of the electronics revolution. Learn how this analog technology lets you store and erase data!
Are redheads going extinct?
science.howstuffworks.com/life/genetic/redhead-extinction.htm
Redhead extinction is the idea that the recessive gene that causes red hair will eventually die out. Read about the theories behind redhead extinction.
17 Bits of Nostalgia from 1957
history.howstuffworks.com/american-history/17-bits-of-nostalgia-from-1957.htm
'American Bandstand' hit the airwaves, and the Russians launched 'Sputnik'. Read about these and more in our list of 17 bits of nostalgia from 1957.
Is there a hole in the universe?
science.howstuffworks.com/dictionary/astronomy-terms/hole-in-universe.htm
A hole in the universe was recently discovered by scientists at the University of Minnesota in 2007. Read about the discovery of a hole in the universe.