Mark McClusky says for elite athletes today, pushing boundaries and breaking records is all about "the aggregation of marginal gains."
Update 2:30 PM: CNN and WCVB-TV in Boston are now both pulling back on reports that an arrest had been made in the Boston Marathon bombings. Boston police deny that an arrest has been made. Numerous media outlets, including the Associated Press, still say an arrest is imminent.
CNN and Boston’s ABC affiliate WCVB-TV are reporting that an arrest has been made in the Boston Marathon bombings, according to law enforcement sources.
CNN’s Boston-born reporter John King reports the break in the case came from enhanced security video from the Lord & Taylor department store one block away from the second blast on Monday.
A second video, from local Boston TV station, also aided in identifying the suspect, King said.
A law enforcement official told King that the video showed a dark-skinned man planting a black bag and leaving the scene.
The Associated Press reports the suspect will be taken into custody by federal marshals and taken to a Boston courthouse, according to an official.