Two things are interesting about this to me: First, the fact that bacteria can have memory!! Second, the fact that this surprises me. Trivially, even for a s

Two things are interesting about this to me: First, the fact that bacteria can have memory!! Second, the fact that this surprises me. Trivially, even for a single cell animal, it is not shocking that it might gain some survival advantage from having a memory of sorts, and that is really not a high bar to jump over in terms of required infrastructure. Almost any sort of very simple memory could be used advantageously.