INHALT
Ellen helps make a waterproof tent to keep the two Mike's dry on their overnight expedition in search of gold-bearing rock. And Kathy and Jonathan make a seismograph using alarm clocks to measure earthquake activity in the area.
Ellen helps make a waterproof tent to keep the two Mike's dry on their overnight expedition in search of gold-bearing rock. And Kathy and Jonathan make a seismograph using alarm clocks to measure earthquake activity in the area.
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