In this "Dear David" installment, CBS News contributor David Begnaud highlights childhood cancer survivors Ellie Koerner and Dawson Nailor reuniting in medical school and an Arkansas hairstylist who spotted skin cancer on a client during a routine appointment.

Childhood cancer survivors reunite 17 years later in medical school

Two first-year medical students at the Philadelphia College of Osteopathic Medicine discovered an extraordinary connection during orientation: they had once battled the same cancer together as 4-year-olds.

Ellie Koerner and Dawson Nailor were both diagnosed with acute lymphoblastic leukemia in 2007 and were treated at the Children's Hospital of Philadelphia. The two had not seen each other since their treatments ended 17 years ago.

Their reunion came dur

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