Mutations are a constant fact of life. And they happen all the time in our body. Is this valid? Yes. Three common causes of mutations are radicals, ionizing radiation, and polymerase errors. To download this video go to: http://www.mediafire.com/?etw9jv1mu4n If you wish to translate this video you can download the PowerPoint file from: http://www.mediafire.com/?wny1z2dz1z1 Learn the facts, spread the truth, and most importantly, Think About It.