The 20th century taught us how far unbridled evil can and will go when the world fails to confront it. It is time that we heed the lessons of the 20th century and stand up to these murderers. It is time that we end genocide in the 21st century.

The United States must also continue to push the United Nations Security Council for strong action to thwart Iran's nuclear ambitions. In the meantime, it is our job to take meaningful steps to eliminate the threats posed by Iran.

Iran's continued pursuit of nuclear weapons, support for international terrorist organizations, and abhorrent human rights practices pose one of the greatest threats to global security.

As many know, brain injury comes in many forms. The two most prevalent brain injuries - stroke and trauma - affect more than 2.2 million Americans, and these numbers are expected to grow.

The attacks in Jordan, just like those before it in Indonesia, Egypt, Spain and the United States, demonstrate that terrorism does not discriminate by race, ethnicity or region. Instead, terrorists indiscriminately target those seeking to live a peaceful, loving and free life.

The 20th century taught us how far unbridled evil can and will go when the world fails to confront it. It is time that we heed the lessons of the 20th century and stand up to these murderers. It is time that we end genocide in the 21st century.

Yet, only years after the Nazi-era, millions were sent to their deaths in places such as Cambodia, Bosnia and Rwanda, and the world once again took too long to act.