Dog-like robots now on sale for $75,000, but buyers must pledge to do no harm

You can now buy one of those unnerving animal-like robots you might have seen on YouTube -- so long as you don't plan to use it to harm or intimidate anyone. Boston Dynamics on Tuesday started selling its four-legged Spot robots online for just under $75,000 each. The agile robots can walk, climb stairs and observe their surroundings with cameras and other sensors. But people who buy them online must agree not to arm them or intentionally use them as weapons, among other conditions. "The key goal for us is to make sure people trust robots," Michael Perry, the company's vice president for business development, said in an interview.