It's no secret that electronic components aren't biodegradable, although some engineers have attempted to develop more eco-friendly versions over the years. A team of researchers at the UK's National Physical Laboratory took on the challenge and wound up creating a circuit board that dissolves in hot water. The device melts away after being submerged, leaving 90 percent of its resistors and capacitors available for reuse. Compared to traditional circuit board recycling, which salvages only two percent of the electronic components, this is a major breakthrough in reducing e-waste. Leave it to one of the world's largest tech companies to bring a modular smartphone to market.