DARPA's tiny robot Olympics tests millimeter-scale machines in disaster response challenges, with untethered bots jumping, lifting, and navigating rubble.

After four years of hype, Optimus shows some progress, yet the humanoid struggles to prove it's worth beyond staged demos.

The remarkable robot dog — or more accurately, its AI-powered brain — can even handle having its legs extended by wooden poles, or having wheels attached. Short of a rocket-propelled grenade coming ...