Paul and J.P. Norden each lost a leg in the Boston Marathon attack four weeks ago. The brothers, who have always been inseparable, said worse than having their limb amputated was being apart when they were taken to two different hospitals after the blast.

They now go to physical therapy together at Spalding Rehabilitation Center every day for three hours. They're learning to balance and do normal activities. They help each other adjust to their new reality, along with support from their family. CNN's Jason Carroll reports.

Krystle Campbell's mother says her daughter "had a heart of gold." The 29 year old restaurant manager died in the Boston Marathon bombing on Monday. In a tragic case of mistaken identity, her family was first told by doctors that she had survived the attack. But the patient they were treating was actually Campbell's friend who was at the race with her that day. CNN's Jason Carroll reports on how she will be remembered by friends and family.

CNN's Jason Carroll talks with Dr. Ron Walls of Brigham and Women's Hospital about the patients in his care, including two in critical condition, who were wounded in the Boston Marathon bombings. Walls says the worst of the injuries happened to people's legs, while the shrapnel wounds have been relatively minor.