Leakey made important contributions to our understanding of human origins through his fossil finds. He later gained fame for taking on poachers who threatened to wipe out Kenya's elephants and rhinos.

Polish-based photographer Kasia Strek documented what it was like for migrants and people in Poland as the crisis evolved at the border in November.

Austin, 68, tested positive on Sunday. He said that his symptoms are mild, and he was fully vaccinated and boosted in October. He plans to continue with key meetings virtually during quarantine.

The authorization comes in the midst of an explosion of COVID-19 cases nationwide driven by the omicron variant — a surge that has brought a spike in pediatric hospitalizations.