This image shows the change in word importance over time for tweets related to the Bill and Melinda Gates conspiracy theory. In the top panel, the x-axis represents time while the y-axis shows important words. Color represents the importance of words, with darker color indicating higher importance. In the bottom panel are word clouds for each topic. Word size corresponds to word weight (higher weighted words appear larger). Credit: Los Alamos National Laboratory A new machine-learning program accurately identifies COVID-19-related conspiracy theories on social media and models how they evolved over timeâa tool that could someday help public health officials combat misinformation online.