IRON CLAD MAGNET: Ashley uses an electromagnet Mr. Wizard has made. They connect a battery and Ashley picks up a pile of paper clips with the electromagnet. CATENARY ARCH: Maria places blocks together on a board to form an arch on its side. SCIENTIFIC NOISE: Mr. Wizard briefly explains to Nicola that an oscilloscope is a device to make waves visible. RUBBER BAND CODE: Bibi examines a rubber band with black marks on it that are a secret message. Mr. Wizard stretches it to expand the marks into letters. She reads a secret message on the rubber band. MONO LAKE: A big, blue lake in the dry desert of eastern California. Despite its high salt content (saltier than the ocean), Mono Lake has supported abundant wildlife for thousands of years. TORSION BALANCE: Mr. Wizard and Leila look at a metal strip suspended horizontally with two C-clamps attached to the end. STEAM ENGINE RUNS WITH C02: Mr. Wizard shows Ashley the various parts of a steam engine.