Scott Pelley interviews John Eastman, the conservative former law professor who championed a radical legal theory to keep President Trump in power. Eastman is now facing charges in Georgia’s election conspiracy case. He has pleaded not guilty. Few people realize it, but Social Security’s mistakes are your responsibility. It often doesn’t matter if it’s not your fault – you still must pay. Anderson Cooper reports. Lesley Stahl travels to an island completely inhabited by monkeys. It’s not open to the public. Researchers have been studying the monkeys for decades. Learn about the behavioral scientific discoveries that may apply to humans.