That’s why oil floats on water. Even if you first pour a layer of oil into a container and then carefully add water on top, the heavier water will start dripping through the oil, forming ...

Water can float on oil, suggest new findings defying conventional wisdom that could have important applications in cleaning up oil spills that endanger seashores and fisheries, researchers say.

Kabra 3D-printed a small prototype of the robot, which he tested in a lab, a swimming pool, and then the open ocean. (The small version, about two feet across, can collect 20 gallons of oil at a ...