Sen. Tom Cotton (R-Ark.) from the start pointed to the lab’s location in Wuhan, pressing China for answers, so the history books will reward him if he turns out to be right. The Trump administration also sought to highlight the lab scenario but generally could only point to vague intelligence. The Trump administration’s messaging was often accompanied by anti-Chinese rhetoric that made it easier for skeptics to ignore its claims.

As a reader service, here is a timeline of key events, including important articles, that have led to this reassessment. In some instances, important information was available from the start but was generally ignored. But in other cases, some experts fought against the conventional wisdom and began to build a credible case, rooted in science, that started to change people’s minds. This has led to renewed calls for a real investigation into the lab’s activities before the coronavirus emerged.

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