in a low—carbon way — you just need to be near a waste heat source and there are plenty of those around the world. thanks, jen. of course, once our crops have been harvested, they need to be stored safely so they don't spoil. an estimated 630 million tonnes of grain goes bad each year, which is such a waste. well, doctor lorenzo conti thinks he might have a solution. doctor lorenzo, what is it? what we have developed, lara, is the world's first subterranean drone and we're using it specifically to help the grain storage operators maintain the quality of their stock. you called it a drone but it doesn't look much like a drone. that's right. since there wasn't a word in the dictionary to describe what it is, we have come up with one. we call it a 'crover'. how does it work and what does it do exactly? it swims through grain in storage, like in silos and sheds, monitoring the conditions of the grain like temperature and moisture and helping maintain quality. how does this vary