Germany just took fusion power one big, important step forward. The country's Max Planck Institute for Plasma Physics has just switched on Wendelstein 7-X, the first large fusion reactor based on a twisty stellarator design. It's only producing hydrogen plasma at the moment and won't actually generate energy, but power isn't really the point. Instead, it'll serve as proof that stellarators could provide energy while operating continuously, unlike current (tokamak-based) fusion reactors that operate in short pulses. They should be safer, too.