From prehistoric times onward, human beings have been curious about the world around them and about worlds far away and out of eyesight. What are the laws that govern the universe? What makes our planet the way it is, regarding everything from the humble atom to the largest landmasses and the encompassing atmosphere of Earth? Why does life develop one way instead of another? How has scientific research and technology improved human life and understanding over the centuries? Explore, search, and satisfy your curiosity on these and any number of other topics within the vast realm of science.