Mister Rogers' Neighborhood (1968)

Season 1: Episode 6

Title number 0006. Opens with Mister Rogers arriving with a large box in a lab coat. To prepare for his scientific endeavor, Mr. Rogers puts on a lab coat and compares various shells and shell-like objects, including a turtle shell, a conch shell, an armadillo's armored shell and a suit of armor. In the Neighborhood of Make-Believe, Bud Alder compares oil-based and water-based paints. After sharing his wisdom with X the Owl, X teaches Lady Elaine various bird names.