If, like a certain Medgadget editor, you culture your own kefir at home, the colony surely starts to feel a bit mundane doing the same thing from day to day. If you want to teach your old bacteria new tricks, you'll have to do it directly by changing its DNA.
Here's Tuur van Balen at the Next Nature Power Show 2011 in Amsterdam showing off how to bioengineer yogurt bacteria at home to manufacture Prozac:
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