it to us as a video text over smell if we all saw it on the show we'll send you a little surprise as a thank you can i just ask. if you can write to us on our website at t w dot com slash science or give us a shout out on twitter and facebook. although not quite as large as blue whales many dinosaurs greeted gigantic proportions the bigger and heavier something is the more energy you need to move this. next story is about to drive designers who founded. to make that process more efficient. to increase or decrease the speed of rotation. leonardo da vinci knew that to 500 years ago your systems haven't changed all that much since then. just take a few gear wheels and a few different sizes and you're sad. but perhaps there is