Thanks for alerting me to this old radio program, electricdisk!
This series consisted of 15 minute shows, similar in format to Ripley’s Believe It Or Not that had aired from 1930 to 1948. It was hosted/narrated by Ken Nordine and was produced by Unusual Features Syndicate. This syndicated series was heard on the Mutual network during 1950 and 1951 on various days and at various times. For example, according to “The Ultimate History of Network Radio Programming and Guide To All Circulating Shows” by Jay Hickerson, it aired on Tuesdays and Thursdays at 9:30 PM from April 17, 1950 through June 5, 1951 and on Saturdays at 5:15 PM from June 30, 1951 through December 22, 1951.
Besides the 15-minute shows, another syndication of 3-minute shows was also produced, again hosted by Ken Nordine.