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Two central article of faith in creationist circles are that speciation has never been observed and that evolution can't be replicated in a laboratory.
So essential are these dogmas to creationism that nothing will shake their faith in them, not even the evidence of evolution being replicated in a laboratory and speciation being observed in the process. You can rarely make any progress with a creationist without these 'killer' assertions being thrown into the debate. They are almost the motto or battle-cry of creationism. So we can be sure the best available dismissal techniques will be brought to bear on the paper published in Nature a few days ago showing exactly that.
That's right, creationists, scientists have observed evolution, including speciation, in the laboratory. And their experiment is reproducible.