it is very fragile. it doesn't work the way real brains work and it is very opaque. we don't really understand what it is doing half the time, and that is not a good enough solution for autonomous systems. nature has come up with weird and wonderful ways of doing things that humans could never figure out, so maybe there is a lot more technologists can learn from the other creatures around us. that's it from us for this week. as ever, you can keep up with the team on social media, find us on youtube, instagram, facebook and twitter at @bbcclick. thanks for watching, and we'll see you soon. bye— bye. hello.