Coach yourself to safer working habits by downloading our free fire diamond poster. It tells you what all the numbers, colors, and symbols mean, enabling you to handle dangerous reagents responsibly. Plus, printing it out and sticking it somewhere obvious means you don’t have to remember it all!

Imagine having tube after tube of competent cells for your transformations, all (virtually) free of charge. The way to reach this nirvana is to make your own competent cells. Traditionally this can be a tricky feat, but the procedure laid out in this guide makes it simple and routine.