The recent listing of Singapore's Nanofilm turned the founder, a former academic, and his wife into billionaires overnight - they may not be the last, going by numbers compiled by The Business Times. According to data compiled using intelligence platform VentureCap Insights and regulatory filings, the founders of 20 prominent Singapore startups already hold equity worth about US$1.77 billion, even though they are some distance from their exits. At the top of the list - which