Concerns about President Biden's cognitive health raise questions about transparency in presidential fitness, focusing on ...

DR. MARC SIEGEL (CONTRIBUTOR): Fetterman himself has said that his stroke was due to a blood clot from the heart. That is very significant, Tucker, because a study out of a journal called Stroke ...

PROGRAMMING ALERT: Watch Dr. Siegel discuss this topic and more on "Fox & Friends" and "America's Newsroom" on Tuesday, May 6. Gain-of-function research has many purposes, including gauging the ...