It's probably a combination of things... The medical robotics companies have always raised pretty healthily. The drone companies are seeing a lot of traction,

It's probably a combination of things... The medical robotics companies have always raised pretty healthily. The drone companies are seeing a lot of traction, as are some of the consumer robot companies. But probably the biggest contributing factor: Major companies like Google, Toyota, and Amazon are spending $Billions each year on robotics efforts... and there are surprisingly few robotics startups for them to draw from. VCs are starting to realize that there are probably some real winners out there, and are actually embracing hardware again.