![Halobacterium salinarum [CC-By-SA-3.0 Steve Cook]](https://www.polypompholyx.com/wp-content/uploads/2013/01/Halobacterium_salinarum-225x300.jpg)
There are many good reasons to visit San Francisco, some of them thoroughly unsafe for work, but one I didn’t consider was to see this amazing sight on the approach to the airport: The pink colour in the water is caused by a bloom of single-celled organisms I must refrain from calling bacteria, since they are not. …