It turns out the Falcon9 that launched last night to send a Dragon capsule full of supplies to the ISS lost an engine. Not lost like the engine simply fizzled out. Lost like BOOM! Yet the safety measures engineered into the rocket kept the other engines protected and functional for a successful launch.
If you ask me designing and building a rocket that can survive an exploding engine is pretty damn impressive.
Explosion is at :27 into the video