The study of African-American inventors concludes with the Boredom Busters at Discovery Place Interactive Museum. From 2-3 p.m., learn about Philip B Downing, inventor of the Street Post Office Box, and build a mailbox. Cost is $5 per person; TMS members are free. Tickets are available at: www.texarkanamuseums.org/events. Call 903-793-4831 for more information.