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How can ozone be both good and bad?
science.howstuffworks.com/environmental/green-science/question162.htm
During the summer I am always hearing about ozone warnings in my city. This ozone is bad. But then I hear about the ozone layer, which is good. How can ozone be both good and bad?
How can parts of Canada be 'missing' gravity?
science.howstuffworks.com/environmental/earth/geophysics/missing-gravity.htm
For more than 40 years, scientists have tried to figure out what's causing large parts of Canada to be "missing" gravity. The force of gravity around Hudson Bay is lower than surrounding areas. Learn about two theories that may explain the phenomenon.
How can recycling impact a community?
science.howstuffworks.com/environmental/green-science/recycling-impact-community.htm
Lots of people consider recycling to be kind of a no-brainer, something we all should do. It's good for the environment, it re-uses materials rather than creates new ones, it reduces landfills - the list goes on and on.
How can soft tissue exist in dinosaur fossils?
science.howstuffworks.com/environmental/earth/geology/soft-tissue-dinosaur.htm
Soft tissue in dinosaur fossils is very rare, and when it does turn up it often contains many surprises. Learn about soft tissue in dinosaur fossils.
How can someone control a machine with her thoughts?
science.howstuffworks.com/bionic-arm.htm
The Rehabilitation Institute of Chicago introduced a new bionic arm that can be controlled by reading a person's thoughts. How does this technology work? Can you control a machine with thoughts? Learn about the bionic arm in this article.
How can spam e-mail help fight HIV?
science.howstuffworks.com/life/cellular-microscopic/spam-hiv.htm
Do spam e-mail and HIV have something in common? Find out if spam e-mail and HIV is linked and learn about new methods for HIV treatment.
How can studies on rats apply to humans?
science.howstuffworks.com/innovation/scientific-experiments/studies-rats-apply-humans.htm
Rats! They're just like family. Evolutionarily, anyway. So when it comes to research and biomedical study, what can they do for us?
How can the moon give us clean energy?
science.howstuffworks.com/environmental/energy/moon-clean-energy.htm
A few decades ago, the pursuit of clean energy was "green." Now, it's a necessity. Not only is our power consumption propelling the human race toward a hot, watery, lonely end, but clean energy tends also to be renewable.
How can there be seedless grapes? How can they reproduce?
science.howstuffworks.com/life/botany/question349.htm
There is a good chance that if you go to the grocery store and buy a bunch of grapes that they will be of the seedless variety. If the grapes are seedless, how are they able to produce new grapes? Find out the answer to that question in this article.
How can two seemingly unrelated species that live in isolation from each other evolve into identical forms?
science.howstuffworks.com/life/evolution/parallel-evolution.htm
Parallel evolution leads two seemingly unrelated species living in isolation from each other to evolve into identical forms. How? Learn about parallel evolution.