WASHINGTON - As many as 90,000 Americans are projected to die from the coronavirus in the next four weeks, the Biden administration warned in its first science briefing on the COVID-19 pandemic, as experts outlined efforts to improve the delivery and injection of COVID-19 vaccines.The hourlong briefing Wednesday by the team charged by President Joe Biden with ending the pandemic, was meant to deliver on his promise of "leveling" with the American people about the state of the outbreak that has already claimed more than 425,000 U.S.