As 2015’s final minutes tick away, it’s gives us a chance to look into the mirror to see what we are leaving behind. Many philosophers have noted that history tends to repeat itself. Terrorism. Gun violence. Racial tensions. Religious differences. Politics. The environment. So we reflect on the events and trends of 2015 in hopes of identifying patterns, learning from the mistakes of the past and building on its successes to take on many of the same challenges in 2016.