Quite recently Boston Dynamics made another cool looking robot that is built with two legs and runs on wheels. In order for this robot to be able to move around without falling over. The ability to not fall over is helped by inertia and the very complex computers within the robot allowing for many calculations to be made in order to put the robots weight in exactly the right spot.
What is the most surprising thing about this robot is it's ability to jump completely autonomously. It is able to detect an object in front of it and make the correct calculations to jump the object and safely land on the other side.
The way the robot turns and stops also shows how inertia is used, as the robot is stopping it will lean back as to counter act the inertia wanting to send the top of the robot forward. Again as the robot is turning to either side, it leans the direction it wants to go in order to not tip over.
Here is a short video demonstrating all of its sensibilities.