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편리한 도구속의 과학원리들 - Season 1 Episode 15 에피소드 15
In order to curb boredom, the islanders cross a previously unexplored mountain ridge, with a mammoth for transport. When the mammoth is stuck dangling over the edge of a cliff, the Inventor uses a hot-air balloon. Topics covered: ballooning, hot air, blimps, expansion, rising, gravity.