President Joe Biden believes that by the end of the year, life in America will be less onerous in terms of restrictions relating to COVID-19, but cautioned that he could be wrong. “All the experts, all the committee that I put together—the leading researchers in the world and the United States are on this committee of mine, headed by Dr. [Anthony] Fauci and others—they tell me be careful not to predict things that you don’t know for certain what’s going to happen, because you’ll then be held accountable,” Biden said Tuesday. “I get that. But let me tell you what I think based on all that I’ve learned and all that I’ve studied and all that I think that I know.” Biden said he was optimistic in part because of the Johnson & Johnson vaccine, which is being considered for emergency use authorization by drug regulators after its underwhelming clinical …