Excited for the August 21 eclipse? Visit our Eclipse 2017 page to explore the science, history, and myths of the event. The Curiosity team will be viewing the eclipse alongside NASA in Carbondale, Illinois. Follow us on Facebook for live videos, trivia, and interviews on the big day.
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Key Facts In This Video
The back of the heart is known as its "base". 01:26
Veins returning from the lungs into the left side of the heart are the only veins that carry oxygenated blood. 03:37
There are four valves leading to or from the heart. 05:01