As America mourned the loss of 20 innocent school children and six staff members in the tragic Sandy Hook Elementary School shooting, we all had one question in mind: Why did this happen?
This may have been the most harrowing mass shooting in recent history, but it's not the only one we've seen. With each tragedy, the desperation for answers grows. Can a killing spree be prevented? Can your genes make you murder? What does the science say? Is there an answer to the problem of gun violence?
Click the link below and watch the video above to learn more. And leave your thoughts in the comment section at the bottom of the page. Talk nerdy to me.