It's official: New York City just gave the green light to the world's first underground park. The Lowline will be built in an abandoned train line in the Lower East Side, and it'll feature high-tech daylighting system that uses mirrors and fiber optics to sustain an underground forest. In other news, a team from MIT has developed a transforming "apartment in a box" - and they're planning to bring it to market in 2017. Google's plans for a crazy canopied headquarters were quashed last year, but thanks to a new deal with LinkedIn the project will actually be built.

Love coffee and mushrooms? Check out this new coffee maker that uses old grounds to grow tasty fungi. In other design news, we spotted an amazing conductive pen that lets you turn simple sheets of paper into electric circuits. A 14-year-old girl used old bike parts to invent a brilliant pedal-powered washing machine</a> that saves time and energy. Olive launched a smart suitcase that automatically follows you around so you don't have to lug luggage. And researchers used bacteria to develop microscopic "wind farms" that could one day power your smartphone.