Using the insights of great mathematicians and endlessly observing the sky, he succeeded in confirming two things that altered human life forever: that there are more galaxies than our own, and that the universe is always expanding. Hubble’s message to us is to find peace in the vastness of the mystery surrounding us, and to be curious. “We do now know why we are born into the world,” he said, “but we can try to find out what sort of world it is.”

    The city was very crowded .” A true story about Bob Redman, a New York City boy who built a series of intricate treehouses hidden in Central Park. This picture book tells the true story of Bob Redman, a child growing up in New York City. Tired of the noise, the people, and the rushing around, Bob took shelter in the natural beauty of Central Park—where he covertly built a series of treehouses, starting with a simple platform and growing more and more elaborate over time. He played cat-and-mouse with the park workers, who kept tearing down his houses, until he was finally caught. But his story ends with a happy surprise . . .