Autonomous drone delivery startup Zipline raised $1.5B at a $21.5B valuation, up from $7.85B after raising $600M in January, and plans to grow US manufacturing (Kelly Cloonan/Wall Street Journal)

Kelly Cloonan / Wall Street Journal : Autonomous drone delivery startup Zipline raised $1.5B at a $21.5B valuation, up from $7.85B after raising $600M in January, and plans to grow US manufacturing, CEO Keller Cliffton says the company's skyrocketing valuation is a sign that autonomous delivery has finally gained wider acceptance.