President Joe Biden made history Friday when he became the first U.S. president to sign reform legislation targeting marijuana into law. The White House announced that Biden signed the bipartisan Medical Marijuana and Cannabidiol Research Extension Act. The landmark legislation is designed to make it easier for scientific researchers to study the plant. The bill also directly directs the federal Department of Health and Human Services (DHHS) to study "the therapeutic potential of marijuana," and it also requires the agency to study marijuana's impairment of adolescent brain development and operational skills. "Research is the foundation of the path forward for marijuana policy," the lawmakers added.