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 ...

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 ...

Oil floats on water and iron sinks but, as the coronavirus panic has swamped global markets, a funny thing has happened: Oil has sunk while iron remains afloat. Brent crude and key automotive ...