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A working demonstration of Dawkin's Weasel, and then another showing how the same algorithm can find a Steiner tree.

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The evolution of the hair cell, marking the beginning of the vertebrate inner ear.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3918741/
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The next time you end up arguing with a YEC, hit them with this:

“Now, it is a disgraceful and dangerous thing for a (nonbeliever) to hear a Christian, presumably giving the meaning of Holy Scripture, talking non-sense on these topics; and we should take all means to prevent such an embarrassing situation, in which people show up vast ignorance in a Christian and laugh it to scorn. The shame is not so much that an ignorant individual is derided, but that people outside the household of the faith think our sacred writers held such opinions, and, to the great loss of those for whose salvation we toil, the writers of our Scripture are criticized and rejected as unlearned men. If they find a Christian mistaken in a field which they themselves know well and hear him maintaining his foolish opinions about our books, how are they going to believe those books in matters concerning the resurrection of the dead, the hope of eternal life, and the kingdom of heaven, when they think their pages are full of falsehoods on facts which they themselves have learnt from experience and the light of reason?” (St Augustine, Commentary on the Book of Genesis).

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PNAS Article about the evolution of ATPases and endosymbiosis that explains (among other things) why eukaryotes like us have bacterial ATPases in our mitochondria.

http://www.pnas.org/content/110/30/12355.full

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I love this diagram and yes we have evidence for every single step. It's fascinating stuff. Some placoderms had a plywood-like bone structure. How cool is that?

http://4.bp.blogspot.com/-WuhmOAUluTg/ULOZnGHxLnI/AAAAAAAAAQI/i0U59C8fUZ4/s1600/vertebrate+evolutionary+tree+stem+gnathostomes.png
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