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.

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 ...

Although scuba divers may appear to be "as free as a fish," they're actually loaded down with quite a bit of gear. The Avelo System is designed to help in that regard, as it moves the functionality of ...

Survival and reproduction of many aquatic and semi-aquatic animals can depend upon how well they float. Tadpoles use various strategies to attain buoyancy, depending upon their stage of development ...

Explaining how a boat like La Salle's La Belle sinks is not all that difficult: The space within the boat fills up with water, either through the hull or over the boat's sides, causing the boat to ...