I like how you defined heath, education, and intelligence as the raw materials, but they don't directly give you the return that will make you wealthy. You need to apply those skills in some way to make income generating assets, and that is the tricky part. For most people, including Robert Kiyosaki, income producing assets basically means buying and renting out property. I disagree with doing that on so many levels…
Stock market index funds seemed to be a good answer in the past. By owning them, you share in the economic growth and income of your country (or another country or set of countries) as a whole. Although, the spectre of Japanese-style stagflation for most of the West makes this less appealing at the moment (although even with the flat growth of the past 13 years, there are still dividend returns.)
Property is popular because everyone has to live somewhere, the old "buy land, they don't make it any more" proverb, and the funemplyoment nature of buying, improving, renting, and selling property.