April 27, 2016 at 02:28AM

Tody I Learned: 1) By far the majority of magnesium ions in a bacterial cell (and, I think, most eukaryotic cells, too) are bound to something at any given time. Only something like 10% of a cell's magnesium ions are actually floating around in solution. 2) In Arch Linux (or any other systemd-based Linux), you can see what services/units are running by simply running "systemctl". 3) ...a new debugging rule to go in my Linux-user debugging toolkit -- if a secondary package manager (in my case, pacaur, which is like pacman (which is like apt-get or homebrew but for Arch Linux) but for unofficial repositories as well as official ones) isn't downloading anything, and your database list is synchronized, then try reinstalling the package manager. You may have to do a manual install, since the package manager isn't working....