What are their Strategies to attain and keep their Wealth?
Why did two of them become Philanthropic after becoming the World's Richest?
Here are Interviews with the Three Richest Humans alive today – the earliest from 1994, the latest from This month.

http://video.google.com/videoplay?docid=515260011274566220

Video Interview with Bill Gates & Warren Buffet (2006)

Interview with Warren Buffet (2006)

Interview with Carlos Slim (2007)

Interview with Bill Gates (1994)

I only see the moneys.

Interview with Carlos Slim (2007)

http://online.wsj.com/article/SB118615255900587380.html

Interview with Warren Buffet (2006)

http://money.cnn.com/2006/06/25/magazines/fortune/charity2.fortune/index.htm

Interview with Bill Gates (1994)

http://ei.cs.vt.edu/~history/Bill.Gates.html

Lakshmi Mittal – 5th Richest in The World

http://www.ihsw.com/NR/rdonlyres/19CB2919-46FF-4BFE-BA70-7EBF344EAFAC/0/Luxembourg050406TelecranTranslation.pdf
http://www.youtube.com/watch?v=UxWgxrmz4YE

Sheldon Adelson – 6th Richest in The World

http://www.charlierose.com/shows/2006/11/16/2/a-conversation-with-sheldon-adelson-chairman-and-ceo-of-the-las-vegas-sands-corporation

http://media.podshow.com/media/261/episodes/26208/thestrip-26208-09-15-2006_pshow_114746.mp3

Bernard Arnault – 7th Richest in The World

http://edition.cnn.com/2005/WORLD/asiapcf/03/16/talkasia.arnault.script/index.html

http://www.bloomberg.com/apps/news?pid=20601109&sid=arqqxZs7e_EE