Although he referred to multiple “Manuals,” the president’s Truth Social screed is really about a single manual: the Federal Judicial Center’s Reference Manual on Scientific Evidence. The Reference Manual serves “as a go-to document judges can use when they deal with issues involving scientific testimony.” For the first time, the most recent version of the manual contains a climate science chapter. It describes the hard scientific evidence that fossil fuel burning is influencing extreme weather events. This science is anathema to the oil industry and to its conservative supporters, including the president, and they have responded by attacking the manual and its authors.