25 Powerful Photos Of Humanity At Its Most Vulnerable

4. Greg Cook was reunited with his dog after a tornado destroyed his home in March 2012.

5. Zanier the dog being buried with full honours in 2000. He saved thousands of lives during the Mumbai serial blasts in March 1993 when he detected over 3,329 kgs of RDX explosives, 249 hand grenades, 600 detonators and 6406 rounds of live ammunition.

6. A man holds the hand of a poverty-stricken child.