Bill Gates is guest editor of TIME’s “The Optimists” issue, featuring a cover portrait of 5-year-old Ethiopian Mohamad Nasir, whom Gates had met in 2012, less than a month after birth.

What happened: "Thirty years ago, 1 in 5 children in Ethiopia didn’t live to their fifth birthdays. Ethiopia wrestled down its mortality rates for children under five by two-thirds from 1990 to 2012. Mohamad is a reminder of how his fate, and the world’s, have changed.

Courtesy: TIME

Why it matters: "Around the globe, child mortality rates are falling, and children have hopes of brighter futures."

Gates writes: "Reading the news today does not exactly leave you feeling optimistic. Hurricanes in the Americas. Horrific mass shootings. Global tensions over nuclear arms, crisis in Myanmar, bloody civil wars in Syria and Yemen ... But these events ... have happened in the context of a bigger, positive trend. On the whole, the world is getting better. "

Gates to Nancy Gibbs on what makes him optimistic about the role technology in the future of work: “There are many problems that we haven’t solved. Obesity, diabetes, Alzheimer’s: These are gigantic problems that there are solutions for. And I do expect that advanced software — AI software — will help us understand the biology, understand how to intervene and improve lives very dramatically."

Warren Buffett on the economy: “I have good news. First, most American children are going to live far better than their parents did. Second, large gains in the living standards of Americans will continue for many generations to come."

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In her new memoir, President Trump's niece reveals how she leaked hordes of confidential Trump family financial documents to the New York Times in an effort to expose her uncle, whom she portrays as a dangerous sociopath.

Why it matters: Trump was furious when he found out recently that Mary Trump, a trained psychologist, would be publishing a tell-all memoir. And Trump's younger brother, Robert, tried and failed to block the publication of "Too Much and Never Enough: How My Family Created the World's Most Dangerous Man."

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Photo: Andre Borges/NurPhoto via Getty Images

Brazilian President Jair Bolsonaro announced Tuesday that he tested positive for coronavirus.

Why it matters: Brazil's coronavirus outbreak is one of the largest in the world, topped only by the U.S., and Bolsonaro has long downplayed the effects of the virus, pushing businesses to reopen over the last few months in order to jumpstart the country's economy.