From microbiologist Richard Lenski's reply to Andrew Schlafly, a creationist who found it difficult to accept that a population of E. coli maintained by Lenski's group for 20 years had evolved the ability to metabolize citrate:
It is my impression that you seem to think we have only paper and electronic records of having seen some unusual E. coli. If we made serious errors or misrepresentations, you would surely like to find them in those records. If we did not, then – as some of your acolytes have suggested – you might assert that our records are themselves untrustworthy because, well, because you said so, I guess. But perhaps because you did not bother even to read our paper, or perhaps because you aren’t very bright, you seem not to understand that we have the actual, living bacteria that exhibit the properties reported in our paper, including both the ancestral strain used to start this long-term experiment and its evolved citrate-using descendants. In other words, it’s not that we claim to have glimpsed “a unicorn in the garden” – we have a whole population of them living in my lab! And lest you accuse me further of fraud, I do not literally mean that we have unicorns in the lab. Rather, I am making a literary allusion.
Definitely worth checking out a description of the affair at
rational wiki. The letter also includes this tasty postscript:
P.S. Did you know that your own bowels harbor something like a billion (1,000,000,000) E. coli at this very moment? So remember to wash your hands after going to the toilet, as I hope your mother taught you. Simple calculations imply that there are something like 10^20 = 100,000,000,000,000,000,000 E. coli alive on our planet at any moment. Even if they divide just once per day, and given a typical mutation rate of 10^-9 or 10^-10 per base-pair per generation, then pretty much every possible double mutation would occur every day or so. That’s a lot of opportunity for evolution.
Via
Chemistry Blog
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