Mark McClusky says for elite athletes today, pushing boundaries and breaking records is all about "the aggregation of marginal gains."
New York Times Reporter David Kirkpatrick sat for two hours on a hotel patio with Ahmed Abu Khattala, the man that authorities and witnesses say was a ringleader in the attack on the U.S. diplomatic compound in Benghazi.
That attack killed four Americans, including U.S. ambassador Christopher Stevens. Abu Khattala denies any responsibility for the attack.
We speak with David about why the man has not been arrested or even questioned.