Michael Bloomberg, the philanthropist and former New York City mayor, made a fortune estimated at $70 billion by selling data, so it’s no wonder that he loves to talk about data and its value.

His foundation, Bloomberg Philanthropies, which says it is “using data to save lives” makes grants to cities to deploy data and evidence. Bloomberg said during his presidential campaign that “data is more important than ever in the era of fake news and alternative facts.” He tweeted: “In God we trust. Everyone else: bring data.” He tweeted, again: “Let science, and good data, and good evidence guide your policy.”