U.K. Joins International Race for COVID-19 Vaccine; WFP Chief Warns of 'Famines of Biblical Proportions'; Trump Signs Executive Order to Halt Some Immigration; Earth Day 2020 during Lockdown; Wealth and Poverty Create Different Challenges for Students; Nursing Homes in U.S. Devastating by COVID-19; Art Museums Attract Thousands of Virtual Guests. Aired 10-11a ET

[10:00:00] HALA GORANI, CNN HOST (voice-over): Hello, everyone. Welcome to CONNECT THE WORLD on CNN. Let's get straight to our top stories. And the race is on for a coronavirus [...]