A post by our friend @AlanFox over at TSZ.
Richard Lenski began the LTEE with 12 populations (six ![Ara^+|41x14] and six ![Ara^-|41x13] of the bacterium Escherichia coli on 24th February, 1988. The experiment is currently housed at Michigan State University and has run continuously apart from a short break while relocating to the present site and another during the height of the Covid-19 outbreak.