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Probably the most sought-after surfing experience is the tube ride (a.k.a. "getting barreled"). A tube ride occurs when the top of the wave pitches over the surfer so that he or she is completely enclosed in an oval space behind the curtain of falling water. Inside the "green room," you are hurtling through a tunnel of water and the only way out (without wiping out) is straight through the opening in front of you. Hollow waves are foot-for-foot the most powerful variety of breaking wave, and good tube riding is really difficult. It requires timing, experience, and skill. The video shows us some world-class surfers making it look easy!

The Department of Defense has put out a call: design a pack of robots. A so-called Multi-Robot Pursuit System would be used to "search for and detect a non-cooperative human subject." Each robot has to weigh 100 kilograms or less, act autonomously (with a human squad leader), negotiate obstacles, and provide immediate feedback. The robots would report back to a human operator, and defer to that human when the robot AI determines that a "difficult decision" is required. The first phase of development is to create the sensors for detecting humans and to conduct feasibility experiments. Then comes the building of a prototype with fully functional sensors. At that point, a third phase would try to establish whether a pack of such robots -- about three to five in number -- could realistically be used for missions involving, according to the proposal, "search and rescue, fire-fighting, reconnaissance, and automated biological, chemical, and radiation sensing with mobile platforms."