Three employees of Tesla, the electric car maker, were killed Wednesday when their plane crashed into a residential area in Silicon Valley, Calif., causing a 10-hour power outage in Palo Alto. http://www.businessweek.com/news/2010-02-18/tesla-says-three-employees-killed-in-silicon-valley-plane-crash.html The twin-engine Cessna 310R came down at 8…