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Why Leaves Aren’t Trees

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Phys. Rev. Focus 25, 4 (2010) – Published February 4, 2010
Three papers explain aspects of the size and structure of natural supply networks such as blood vessels and leaf veins.
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How Steady is a Molecular Clock?

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Phys. Rev. Focus 20, 9 (2007) – Published September 19, 2007
Calculations relate the properties of DNA and proteins to their suitability as “clocks” for measuring evolutionary time in a species.
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Separating the Good Hearts from the Bad

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Phys. Rev. Focus 2, 12 (1998) – Published September 15, 1998