The U.S. Centers for Disease Control and Prevention has reversed highly criticized guidance suggesting people who were exposed to someone with COVID-19 don't need a test if they don't have symptoms. A Pew Research Center poll reveals public confidence in a coronavirus vaccine has plunged in the United States over the past 4 months. IBM announced a "road map" for the development of a full-fledged quantum computer. Three months after retracting a high-profile COVID-19 paper, editors at The Lancet enact policy changes meant to keep flawed studies using large medical data sets from slipping past peer review again. And the Sun enters a new solar cycle while arctic sea ice drops to a near-record low.

美国疾病控制与预防中心已经取消了备受批评的指南，该指南建议那些接触过COVID-19的人如果没有症状则不需要进行检查。皮尤研究中心（Pew Research Center）的一项民意调查显示，公众对过去4个月来美国冠状病毒疫苗暴跌的信心。IBM宣布了开发成熟量子计算机的“路线图”。在撤回一份备受瞩目的COVID-19论文三个月后，《柳叶刀》杂志的编辑们制定了政策变更，以防止使用大型医学数据集进行的有缺陷的研究不再越过同行评审。太阳进入新的太阳周期，而北极海冰下降到接近纪录的低点。