Marc Raibert

You know, the slow-mos of cheetahs running are incredible. You know, they're they, there's so much back motion and, uh, you know, grace. And of course they're moving very fast. Uh, The animals running away from the cheetah are pretty exciting.

You know, the slow-mos of cheetahs running are incredible. You know, they're they, there's so much back motion and, uh, you know, grace. And of course they're moving very fast. Uh, The animals running away from the cheetah are pretty exciting.

You know, the pronghorn, which, you know, they do this all four legs at once jump called the prong to kind of confuse the, especially if there's a group of them, to confuse whoever's chasing them. So they do like a misdirection type of thing? Yep, they do a misdirection thing.

You know, the pronghorn, which, you know, they do this all four legs at once jump called the prong to kind of confuse the, especially if there's a group of them, to confuse whoever's chasing them. So they do like a misdirection type of thing? Yep, they do a misdirection thing.

You know, the pronghorn, which, you know, they do this all four legs at once jump called the prong to kind of confuse the, especially if there's a group of them, to confuse whoever's chasing them. So they do like a misdirection type of thing? Yep, they do a misdirection thing.

The front on views of the cheetahs running fast where the tail is whipping around to help in the turns, to help us stabilize in the turns. That's pretty exciting.

The front on views of the cheetahs running fast where the tail is whipping around to help in the turns, to help us stabilize in the turns. That's pretty exciting.

The front on views of the cheetahs running fast where the tail is whipping around to help in the turns, to help us stabilize in the turns. That's pretty exciting.

But they also turn very fast.

But they also turn very fast.

But they also turn very fast.

Everything in the body is probably helping turn, because they're chasing something that's trying to get away that's also zigzagging around. But I would be remiss if I didn't say humans are pretty good, too. You watch gymnasts, especially these days, they're doing just incredible stuff.

Everything in the body is probably helping turn, because they're chasing something that's trying to get away that's also zigzagging around. But I would be remiss if I didn't say humans are pretty good, too. You watch gymnasts, especially these days, they're doing just incredible stuff.

Everything in the body is probably helping turn, because they're chasing something that's trying to get away that's also zigzagging around. But I would be remiss if I didn't say humans are pretty good, too. You watch gymnasts, especially these days, they're doing just incredible stuff.

In Big Dog. Big Dog. Yeah, Big Dog came first, and then Little Dog was later. And you know, there was a... There's a big compromise there. Human knees have multiple muscles, and you could argue that there's, I mean, it's a technical thing about negative work. When you're contracting a joint, but you're pushing out, that's negative work.

In Big Dog. Big Dog. Yeah, Big Dog came first, and then Little Dog was later. And you know, there was a... There's a big compromise there. Human knees have multiple muscles, and you could argue that there's, I mean, it's a technical thing about negative work. When you're contracting a joint, but you're pushing out, that's negative work.

In Big Dog. Big Dog. Yeah, Big Dog came first, and then Little Dog was later. And you know, there was a... There's a big compromise there. Human knees have multiple muscles, and you could argue that there's, I mean, it's a technical thing about negative work. When you're contracting a joint, but you're pushing out, that's negative work.

And if you don't have a place to store that, it can be very expensive to do negative work. And in Big Dog, there was no place to store negative work in the knees. But Big Dog also had pogo stick springs down below. So part of the action was to comply in a bouncing motion. Later on in Spot, we took that out. As we got further and further away from the leg lab, we had more energy-driven controls.

And if you don't have a place to store that, it can be very expensive to do negative work. And in Big Dog, there was no place to store negative work in the knees. But Big Dog also had pogo stick springs down below. So part of the action was to comply in a bouncing motion. Later on in Spot, we took that out. As we got further and further away from the leg lab, we had more energy-driven controls.

And if you don't have a place to store that, it can be very expensive to do negative work. And in Big Dog, there was no place to store negative work in the knees. But Big Dog also had pogo stick springs down below. So part of the action was to comply in a bouncing motion. Later on in Spot, we took that out. As we got further and further away from the leg lab, we had more energy-driven controls.