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People wearing face masks walk on a street Sunday in the Hongdae district of Seoul, South Korea. Ed Jones/AFP via Getty Images hide caption

Demonstrators wearing face masks gather Sunday in Marseille, France, to pay tribute to teacher Samuel Paty, who was beheaded after he showed his class cartoons depicting the Prophet Muhammad. Denis Thaust/SOPA Images/Getty Images hide caption

Ranjana Dwivedi (in purple sari) is a health worker in her village in India. Coronavirus education is a top priority. Center: Iceland's chief of health, Dr. Alma D. Möller, leads the pandemic response. Right: Sheeba Shafaq, a doctor who left Afghanistan because of threats to her life, is now a supervisor at a COVID-19 testing unit in California and pursuing a U.S. medical license. Rishikesh Dwivedi; Sigga Ella for NPR; Jade Sacker for NPR hide caption

More than 40 million coronavirus infections have now been reported worldwide. Here, a staff member at a school in Moscow uses an infrared thermometer on Monday to screen students. Sergei Fadeichev/TASS via Getty Images hide caption

Movsumov Qowkar, 32, checks his neighbor's home damaged by shelling in the city of Terter early on Sunday. Bulent Kilic/AFP via Getty Images hide caption

A demonstrator carries an "I am Samuel" sign as people gather Sunday in Place de la République in Paris to pay tribute to slain history teacher Samuel Paty. Similar rallies took place in other French cities as the country reels from the attack. Bertrand Guay/AFP via Getty Images hide caption

New Zealand Prime Minister Jacinda Ardern, right, is congratulated by her partner Clarke Gayford following her victory speech to Labour Party members at an event in Auckland, New Zealand on Saturday. Mark Baker/AP hide caption

Authorities in France say they've detained nine people in connection with the decapitation of a history teacher in a Paris suburb on Friday. The teacher had shown caricatures of the Prophet Muhammad to his class, authorities said. Michel Euler/AP hide caption

When it's cold outside, is it safe to bring a socially distanced gathering into your house if the windows are open for a short bit and then shut so indoor temperatures don't plummet? We answer this question below. Tessa Bunney/Corbis via Getty Images hide caption

Riot police use water cannons to disperse pro-democracy protesters during an anti-government rally in Bangkok on Friday. NurPhoto via Getty Images hide caption

A seaside scene in Indonesia. As countries like Indonesia move up the income ladder, some health conditions improve — but new threats, like non-communicable diseases, loom large. Tommy Trenchard for NPR hide caption

Ultra-Orthodox Jews watch a funeral for Rabbi Mordechai Leifer from their balconies in the port city of Ashdod, Israel, on Oct. 5. The rabbi, who had been the spiritual leader of a small ultra-Orthodox community founded a century ago in Pittsburgh, died after being infected with COVID-19. Tsafrir Abayov/AP hide caption

Geraldine Roman, the first openly transgender person to be elected to the Philippine Congress, visits a vegetable garden in Bataan. She leads a program called Oh My Gulay — gulay is Tagalog for "vegetables." It encourages people to grow vegetables to eat and sell and is aimed especially at those who have lost income as a result of the pandemic. Hannah Reyes Morales for NPR hide caption

In this photo released by Xinhua News Agency, residents line up for coronavirus tests in Qingdao this week. China says it has carried out 10 million tests in the northern port city with no new cases found. Li Ziheng/AP hide caption

Pro-democracy protesters hold up a three-fingered salute Thursday at Bangkok's Ratchaprasong intersection. Lauren DeCicca/Getty Images hide caption