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hard problems

heart
Image credit: Patrick J. Lynch, medical illustrator, CC BY 2.5 <https://creativecommons.org/licenses/by/2.5>, via Wikimedia Commons.

Exposing the Heart of Neo-Darwinism 

At complete rest, for your organs and tissues to work properly, your heart must pump out about five liters of blood per minute. Read More ›
crocodile eye
Photo: A crocodile's eye, by Alias 0591 from the Netherlands, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons.

How Does the Crocodile Hold Its Breath So Long?

The actress Kate Winslet can hold her breath for seven and a quarter minutes. A crocodile, though, can hold his breath for hours. Read More ›

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