by Me­chas Zam­brano — Just like solv­ing a cross­word puz­zle or a su­doku, it is also greatly grat­i­fy­ing when ap­par­ently ob­scure sci­en­tific obser­vations are fig­ured out. There are many ex­am­ples in mi­cro­bi­ol­ogy of ob­ser­va­tions that, though they hint at some bi­o­log­i­cal...