It faces a class-action lawsuit related to the Triumph's last cruise, when passengers reported that food was scarce, cruise goers sweltered in the heat with no air conditioning, toilets overflowed and human waste ran down the walls in some parts of the ship.

CNN: SHARE THIS

But the deeper lines are trickier: space is so tight that there is nowhere for waste heat to go, which makes traditional air-conditioning impossible.

ECONOMIST: London Underground

The collector also promises to do more with sunlight once it's trapped: since the microchannels should absorb more than half of the waste heat, their hot water byproduct can either be filtered into drinkable water or converted into air conditioning.

ENGADGET