Skobo the Clown - a k a Scott Smith of Salt Lake City - laughs as first-graders steal his hat Fri-day at Midvale Elementary. Sko-bo was giving lessons in weights and measures - using examples from the big top. This year, he showed them the tallest man on Earth, who is 8 feet tall; the smallest man on Earth, who is 33 inches tall; and Marina, the lady who can fit into a 14-square-inch cube. Skobo also invited kids to the Ringling Bros. and Barnum & Bailey Circus parade - the first since 1920. The performers will march down Main Street Thursday at noon. The circus is also hosting an essay contest, and the winner will ride on the circus train from Ogden to Salt Lake.