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Design, Engineering & Technology
Blood, concrete, and dynamite: Building the Hoover Dam
Lesson duration 05:12
Social Studies
How one of the most profitable companies in history rose to power
Lesson duration 05:05
Design, Engineering & Technology
Yes, scientists are actually building an elevator to space
Lesson duration 05:19
Science & Technology
Nature's fortress: How cacti keep water in and predators out
Lesson duration 04:20