Sam Altman has recently expressed interest in seeing more 'high-tech' submissions to YC http://blog.samaltman.com/new-rfs-breakthrough-technologies. I agree that defining 'high-tech' vs 'tech' is a bit ambiguous and fraught with potential disagreement, however for the purposes here, we are talking about companies that engage in some type of basic R&D in pursuit of the core product development.
'Science' is a grouping used to categorize funding from the National Science Foundation (NSF) - cross-functional, but a good enough bucket for the purposes of the key used.
I suspect most people here on HN (if not the world) are interested in 'tech', and consider it 'high-tech'. I consider tech to be consumer tech 80% of the time. This report is looking more at Defense (Military I assume is what that means), Space (Satelittes, Rovers, etc), Health (drugs, and hopefully some of the tracking tech), Science (I have no idea what that means as an investment vehicle), other (THAT's US!).
Are there many people here working in Defense, Space or Health ?
Also, as this lists the percentage of a portfolio that is invested in these sectors, is that really the measure of who's 'top'? Don't we have to consider how large the funds are?