'Truly our hero!': Teacher donates kidney to his student
'I took an oath': Cop saw Facebook plea so she helped stranger's kid
Amazing teacher donates kidney to student with rare disease
One good deed sets off chain of life-saving kidney donations
Brave mother risks death to save sick son
Teacher gives student's mother the greatest gift possible
Update: Dad's viral Disney World plea for a kidney answered by kind stranger
Holiday miracle as seriously ill boy gets to visit the beach for the first time
Stranger tries to help dad by sharing this photo online… but something unexpected happens
