smallpox epidemic

10,000 years ago, a deadly virus 'hit' in northeastern Africa, they spread through the air, attacking the victims' skin, bone marrow, spleen and lymph nodes.

All babies born after 1977, who enjoyed a childhood vaccination program, owe something to Henderson.

The vaccine, since its discovery and use, has protected us from horrible diseases, seemingly impossible to cure, so this is one of the greatest discoveries of humanity.