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The true story of how a scientist saved the planet from environmental disaster. Mexican American Mario Molina is a modern-day hero who helped solve the ozone crisis of the 1980s. Growing up in Mexico City, Mario was a curious boy who studied hidden worlds through a microscope. As a young man in California, he discovered that CFCs, used in millions of refrigerators and spray cans, were tearing a hole in the earth's protective ozone layer. Mario knew the world had to be warned--and quickly. Today Mario is a Nobel laureate and a recipient of the Presidential Medal of Freedom. His inspiring story gives hope in the fight against global warming.
Water, air, sunlight, plants . . . we need these elements to live in this world. But does the world need us? And what would happen to the world if humans were g
Imagine serving as a park ranger for our U.S. National Parks! If you were a national park ranger, you'd spend every day in one of the most treasured places in A
This is a fascinating and enjoyable popular science book on gravity and black holes. It offers an absorbing account on the history of research on the universe a
The sun is out in the day and always has a circle shape. The moon's shape seems to change and you can sometimes see it in the daytime and at night. What are the
The true story of how a scientist saved the planet from environmental disaster. Mexican American Mario Molina is a modern-day hero who helped solve the ozone cr
