Cobalt's a stabilizer in the cathode. And so as you start to... Because of the issues around cobalt... So when I started selling cobalt into lithium-ion batteries, the dominant chemistry was what's called 111. So it's one part nickel, one part manganese, one part cobalt. So the cathode was one third cobalt. Now we're moving forwards. And because of the pressures around the DRC, et cetera, and everything I've mentioned, the chemistry which is likely to be rolled out in the next wave of electric vehicles is 811. So eight part nickel, one part manganese, one part cobalt. Once you go below 20% cobalt in the battery, it becomes unstable. So there's a very complex battery management system to kind of keep it safe. But in answer to your question around are there batteries without cobalt in it? I mean, the Chinese, for example, use what's called an LFP, lithium phosphate battery, in their buses. And the reason for that is, I mean, simplistically, the bigger the battery, if something goes wrong, the bigger the bang. So in a bus, for example, you'll never have an 811. You'll never have a low cobalt chemistry in a battery that large in a vehicle which is carrying passengers. It's just too dangerous.