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How to Care for Your Ears
health.howstuffworks.com/wellness/hygiene-tips/how-to-care-for-your-ears.htm
Taking care of your ears is a small price to pay in return for how much they do for you. Learn how to clean, care for, and protect your ears.
How Tunnels Work
science.howstuffworks.com/engineering/structural/tunnel.htm
Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.
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