Your lungs are always hard at work. Those two spongy, air-filled organs on either side of our breastbone are constantly taking in fresh air, and removing waste gases (e.g., carbon dioxide) from your body. When your lungs are working as they should, it's easy to forget just how important they are to your body's functioning—but …
Read More »Find Out What You Know and Don't Know About Sex by Taking This 10-Question Sex Quiz
It may have been a while since you were in high school, but how much …
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