Mark McClusky says for elite athletes today, pushing boundaries and breaking records is all about "the aggregation of marginal gains."
Note: Here & Now is providing special coverage of the president’s remarks
President Barack Obama is sending up to 300 military advisers to help Iraqi forces stem violent sectarian fighting.
The president announced the deployment from the White House Thursday after meeting with his national security team.
Obama said U.S. forces will not be returning to combat in Iraq but will help train Iraqis.
He also says the U.S. is increasing its intelligence efforts in Iraq and is prepared to create joint operations centers to share with Iraqis.