Pic­tures Con­sid­ered #56 by Christoph — Micro­bio­lo­gists deal with salt, sodi­um chlo­ride, all the time. Most growth me­dia for our cher­ished re­search con­tain at least "a pinch of salt." Or we need salt as a com­po­nent of buf­fers for bio­che­mi­cal ex­pe­ri­ments that re­quire de­fined con­cen­tra­tions of Na+ and Cl− ions. How­ever, we usu­al­ly on­ly see crys­talline salt when we take...