Ever since the light bulb's invention 150 years ago, artificial light has illuminated homes, streets, and skies -- but with some unintended consequences. Learn about the major types of light pollution, their impact on human health, and how the worldwide glow from artificial light may continue to grow.
There are many benefits to using renewable energy resources, but what is it exactly? From solar to wind, find out more about alternative energy, the fastest-growing source of energy in the world, and how we can use it to combat climate change.
An oil spill endangers an otter, and Eliza Thornberry sets out to rescue it. When the time she recues it, the fire has already spread, making her unable to escape. Her parents come to her aid to make the rescue mission successful.
The speakers describe a luxurious party during the Gilded Age, and how it was criticized due to the party's great expenses during a time of struggle for many working-class families. The narrator mentions how the major economic growth led to a large wealth gap between the rich and poor, and how the wealthy minority essentially gained control of America.