With almost $100 billion to his name, Microsoft co-founder and philanthropist Bill Gates has an intimidatingly large heap of funds to deploy. Wednesday, Gates revealed the best investment he has ever made in an essay in The Wall Street Journal. It’s the $10 billion he’s invested, through the Bill & Melinda Gates Foundation, into three particular organizations that increase access to vaccines and medicines for people who need them around the world. Gates says investing $10 billion in Gavi, the Vaccine Alliance; the Global Fund; and the Global Polio Eradication Initiative, which help deliver drugs to developing countries, has been a rewarding experience because unlike other kinds of investments, they are consistently

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