Shark intestines inspire pipes with a strictly one-way flow
3-D printing: A means of producing physical items — including toys, foods and even body parts — using a machine that takes instructions from a computer program. That program tells the machine how and where to lay down successive layers of some raw material (the “ink”) to create a three-dimensional object. angle: The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet. coil: Concentric rings or spirals formed by winding wire or some other fiber around and around a core; or the shape that such a wire would make. colleague: Someone who works with another; a co-worker or team member. contaminant: Pollutant; a chemical, biological or other substance that is unwanted or unnatural in an environment (such as water, soil, air, the body or food). Some contaminants may be harmful in the amounts at which they occur or if they are allowed to build up in the body or environment over time. current: A fluid — such as of water or air — that moves in a …
