My friend the Vulture is a venture capitalist in Silicon Valley. He recently wrote a piece for us and I've been hoping he would do another one. I asked him what he thought of the Box IPO, which is taking place today. Shares last night priced at $14 per share, which will imply a valuation of $1.7 billion for Box — which last July raised a private round at $2.4 billion. Meaning: Box is limping into the public markets. But maybe, at this price, Box is a steal? Vulture doesn't think so. In fact he was brutal — especially about the VCs who are foisting this lump of coal onto the public while also setting up a sweetheart deal for themselves.

We're fascinated by Uber. It's a hugely successful service that's reshaping urban transportation. But it's also kind of a black box. With your help, we want to take a look inside.