North Allegheny High School sophomore Mason Blackburn wanted Alex the Lion to escape the zoo, but it wasn't that simple.
The team hit a few roadblocks along the way, he said. Levers overcomplicated the motions, so they tried a simpler pulley system. It took a lot of trial and error, Blackburn said.
"We certainly learned a lot," he said. "We had several of these swinging hooks and each hook would transfer energy to the next hook. Eventually that was too complicated."