role, you can stay on mute and temporarily unmute yourself by holding down the space bar. if you can, avoid typing on your computer while you're presenting, especially if you're using the internal microphone. we can all hear that clattering unless you're on mute. there's an old saying on tv — always assume your mic is hot, or live, so don't say anything you don't want broadcast. and always assume, if you're using the chat, that you might accidentally send your hilarious observations to everyone by mistake! there's currently no standardised way to end a call, though it's perfectly acceptable to wave or, if you want to be discreet, you can type your thankyous and goodbyes in the chat window. before you go, unless you're wearing wireless headphones, remember that you're still plugged in. that's better. that was lj. now, over the past few years, we've found ourselves spending more and more time inside food computers. now, these mainly involve growing food in special nutrient mixes inside shipping containers. you may remember the