Don’t tell Diane my partner but I found a bacterial biofilm growing under the rim of the toilet in our en suite bathroom. Using General Kitchen Agar (GKA), a bacteriological medium that can be made at home and with ingredients that can be purchased at any supermarket I cultured the bacteria from the biofilm. Here they are visualized under a UV/Blacklight (again readily available). This reveals that some of the bacteria are highly fluorescent (the ones that appear to glow blue) and are probably Pseudomonas species. Am I concerned with this apparent lapse of home hygiene? Not at all, it’s just another striking example of the ability of bacteria to adapt to the new environments that we seem to perpetually, and unintentionally, create for them.