Ah, the stately hot air balloon. Not really useful for all that much except for having a grand old time floating around the skies, it's still a marvel of simple physics. Fill a giant balloon with air.

Swedish company NoviOcean has tested a third-gen prototype of its combination wind/solar/wave energy platform, a floating platform rated for up to 1 megawatt of consistent clean energy around the ...

Editor's Note: Julian Hunt, the lead researcher on this study, has contacted us to say the figures quoted in the original press release, as well as the research paper and subsequently this piece, are ...