By: Lucas Daprile, Treasure Coast Newspapers
Microsoft co-founder Bill Gates put his mouth where his money is.
Standing in front of an industrial behemoth in Dakar, Senegal — with a crowd and cameras watching — an engineer turned a valve that poured a clear liquid into Gates' drinking glass. He wore a nervous smile as he took a sip.
After all, just five minutes earlier, the liquid had been raw sewage.
"It's water!" Gates declared in a video on Janicki Bioenergy's website…