Norbert Pearlroth was the sole researcher for Ripley’s ‘Believe It or Not!’ newspaper panel. He spent 10 hours a day, six days a week at the New York Library researching. He produced 24 pieces of content a week for 52 years. – WTF Fun Facts
researcher
WTF Fun Fact – Serial Killers At Large
Archivist and researcher Thomas Hargrove, who works with the non-profit Murder Accountability Project (MAP), estimates that some 2,000 serial killers are at large in the United States. – WTF Fun Facts
Source: https://www.newsweek.com/serial-killers-united-states-how-many-718232