3D Hubs co-founder Brian Garret holds a set of headphones, the first object he 3D-printed, as he poses for a photograph at the company's office in Amsterdam. In a continent where one in five young people are out of work, governments are pumping more and more cash into startups in the hope they can goose economic growth. Exact numbers are hard to determine, but according to AngelList, a website for new companies, there are now more than 4,700 startups in Europe, compared with nearly 14,000 in the US. Reuters/Toussaint Kluiters/United Photos