Science Roundup: Flying vehicle defying traffic; lab-grown shrimp

Following is a summary of current science news briefs.

Hydrogen-powered flying vehicle touted as Southern California traffic tonic

Developers of a multi-rotor hovercraft billed as the first flying vehicle to be powered by hydrogen fuel cells unveiled a full-scale model on Wednesday in Southern California, in a show-and-tell that raised some eyebrows but never left the ground. A mockup of the futuristic aircraft, dubbed "Skai" by its inventors, was put on exhibit for investors, the news media and other invited guests outside the BMW Group's Designworks studio in Newbury Park, a suburb north of Los Angeles.

From sky farms to lab-grown shrimp, Singapore eyes food future

Singapore, the tiny Southeast Asian city-state, is an unlikely place for a farming revolution. With tiered fish farms, vegetable plots atop office buildings and lab-grown shrimp, the island aims to beef up its own food production and rely less on imports to feed its 5.6 million people.