Well, to your last point, the people I deal with are all science and technology angel investors--i.e., they're successful technology entrepreneurs who've made money building their own businesses and now are willing to put some of that back, both in time and money. That's the differentiating feature. They're not just investors, they're also mentors at the same time. There are a few silent investors, but not too many.
As far as the profile goes, there are some very young ones. In my fund, for example, I have some in their 20s, I have some in their 80s. It's quite a range. There are serial entrepreneurs who like to score and then score again and again. Then there are those who like to score once, and then they spend their time helping many others develop their businesses. It's quite a mix.