Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only.…

Dr. Jason Fung forever changed the way we think about o…

Travel into the circulatory system to see how blood pressure helps deliver oxygen and nutrients to your body’s tissues.

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If you lined up all the blood vessels in your body, they’d be 60 thousand miles long. And every day, they carry the equivalent of…

Is sleeping position that important? Would we be better off without a pillow? The science addressing these questions is lacking, but we can still make some conclusions based on the research.

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当北京的夜晚万家灯火已经亮起，有些男人选择在漆黑的湖边独自钓鱼，一坐坐到天亮，这些夜钓的男人中，有人扛着中年压力、孤立无援；有人3年间失去11个亲朋好友;还有人照顾瘫痪在床的父亲超过10年……能钓上多少鱼并不重要，在他们眼里，夜钓其实和坐禅是一个道理，享受的是孤独、平静的过程。

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This sounds like a quirky, foreign story--until you realize what they're really doing.

許多人都有抖腳的習慣，但在別人面前這是個很粗魯的行為，甚至有人說抖腳抖多了其實對身體不太好，真的是這樣嗎？

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I've been doing yoga for 15 years. I'd noticed I think better after it, but I didn't realize it had lasting effects on brain structure. https://t.co/NsDFRHfV9G

阿福今天特别携手：CCVV阿福卫视，对中国妈妈和德国妈妈进行了采访！！！