It's no secret why poor countries don't have as many vaccines as rich countries.

"There's really just a scarcity of doses," says Kate Elder, senior vaccine policy adviser at Doctors Without Borders' Access Campaign. The question is, how do you fix it?

As we approach President Biden's 100th day in office at the end of this month, some observers are flattering him with comparisons to two legendary Democratic presidents of the 20th century — Franklin D. Roosevelt and Lyndon B. Johnson.

Those names reportedly came up when historian Jon Meacham convened a group of his colleagues at the White House in early March for a private session with Biden. And since then, the aptness of comparing this new president to such transformative figures of the past has become a matter of some debate in Washington and beyond.