A "First-Day of Issue Ceremony" is being held Thursday at noon in Louisville in honor of the stamp's release. It's being held at the Angel's Envy Bourbon Club at UofL's L&N Federal Credit Union Stadium on South Floyd Street. It is free and open to the public. Those wishing to attend are asked to register in advance by clicking here.

Muhammad Ali once named the heavyweight he feels would have caused him the most problems inside a boxing ring.