and Barometers" – Make an antiseptic lotion, a microscope, and a weather station. "Time and Transmitters" – Make a radio, clock, and kite. "Feel the Heat" – Make a freezer, thermometer, and sunscreen. "Sun and Sea" – Make a lamp that could function underwater, and to generate electrical energy to charge up a battery. "The Science of Celebration" – Make musical instruments and fireworks for a party. New scientists featured in this series were: Kathy Sykes, science communicator and physicist Ellen McCallie, ecologist and teacher Anna Lewington and Vanessa Griffiths from the first series were not featured in this series. Series 3 This series takes place on the West Coast of the South Island of New Zealand, has six episodes, and features the same scientists as the previous series. "Gold Rush" – Collect gold from a river, build a metal detector, and construct a super-accurate balance. "Shakers" – Build an automatic gold panning machine, create cosmetics, and look for evidence of earthquakes in trees. "Quakers" – Build a waterproof tent and a seismograph. "Ice" – Measure the speed and melting rate of a glacier and keep warm without a fire. "Treasure Hunt" – Build a device for measuring altitude to assist in finding gold, and extract gold from rock. "The Big Smelt" – Smelt the gold and craft a souvenir from it. Series 4 This series takes place at Darwin Mine, adjacent to Death Valley National Park in California and has six episodes, all involving space exploration. Four scientists from the previous series (Ellen McCallie, Jonathan Hare, Mike Bullivant, and Kathy Sykes) are featured plus a new scientist, Iain Stewart, the show's first geologist. Mike Leahy from the previous series is not featured in this series. "'Rover": Build a rover, find water and purify it. "Communication": Send a communication in a way that didn't rely purely on sound (by altering the vibrations of reflected sunlight, which is then detected by a transistor functioning as a light detector), and make a pen that works in zero gravity. "Spacesuit": Design a cooling system for a spacesuit. "Impact": Measure the size of the meteor that created Barringer Meteor Crater. Iain and Kathy travel to Arizona to see the crater. Mike stays behind, and experiments with impact. Jonathan and Ellen make a telescope using an eyepiece and mirror they find in the chest given to them at the start of the episode (their task