What looks like a flying saucer, takes off like a helicopter and flies like a plane? The next remote-controlled surveillance aircraft on the hunt for terrorist fugitives like Osama bin Laden, apparently.

A robot for "printing" houses has been developed that takes instructions directly from an architect's computerized drawings and then squirts successive layers of concrete on top of one other to build up vertical walls and domed roofs. The precision automaton could revolutionize building sites.