It's the 21st century and nearly half of all Americans still believe that God created people. Our politicians shy away from publically embracing the fact of evolution, and there is a shameful lack of evolution in science classrooms. Evolution by natural selection explains the development of life on Earth and the origin of modern humans, and it’s time we say that loudly and clearly to a new generation of students. Evolution: What Every Teenager Should Know is aimed at high school students, to answer questions they may have about how evolution works. The book grew out of discussions with the author’s teenage son, and tries to enlighten students at a time when they are open to ideas that their parents may not have encouraged them to learn or embrace.