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Why did cars become the dominant form of transportation in the United States?
auto.howstuffworks.com/cars-dominant-form-transportation.htm
Why did cars become the dominant form of transportation in the U.S.? In this article, find out why cars became the main form of transportation in the U.S.
Why can one perfume produce different scents on the same person?
lifestyle.howstuffworks.com/style/body-scents-fragrances/perfume-difference.htm
Why can one perfume produce different scents on the same person? Read on to find out why one perfume can smell different on the same person in this article.
Why is there fluoride-free toothpaste?
health.howstuffworks.com/wellness/oral-care/products/fluoride-free-toothpaste.htm
Fluoride-free toothpaste is an option, but why would you want to use it? Find out why there is fluoride-free toothpaste.
Why do they include jokers in a deck of cards?
entertainment.howstuffworks.com/question310.htm
Why do they include jokers in a deck of cards?
Why can't you tickle yourself?
science.howstuffworks.com/life/inside-the-mind/human-brain/question511.htm
Tickling yourself is a lot harder than it seems. Have you ever wondered why you cannot tickle yourself? Find out why self-tickling seems impossible.
Why do people collect shark teeth?
animals.howstuffworks.com/fish/sharks/shark-teeth.htm
Collecting shark teeth is a hobby for many people, but why do we do it? Learn why collecting shark teeth is like gathering up pieces of history.
Why Do Dogs Sniff Each Other's Butts?
animals.howstuffworks.com/pets/dogs-sniff-butts.htm
To a human it's unimaginable - sniffing another's derriere. But to our canine companions, it's totally normal. But why? Why?
What are marbles and why do NASCAR drivers try to avoid them?
auto.howstuffworks.com/auto-racing/nascar/nascar-basics/nascar-marbles.htm
Marbles are tiny bits of rubber tire detritus that accumulate on the racetrack. Learn more about NASCAR marbles here.
Why does Apple name its OSs after big cats?
computer.howstuffworks.com/macs/apple-os-big-cats.htm
Why does Apple name its OSs after big cats? Find out why Apple names its OSs after big cats at HowStuffWorks.
Why are some people born with a reversal of organs?
health.howstuffworks.com/human-body/parts/reversal-of-organ.htm
Why are some people born with a reversal of organs? Find out why some people have their organs reversed and living on the opposite side of their body.