A person who has made an impact on me is Leymah Gbowee of Liberia  - 1 of the 3 women who won the Nobel Peace Prize this year. I had the privilege to talk to her at a conference two years ago. She told the audience then that we can all make a difference (to Africa) When I spoke to her in person and told her that I had started my teaching career in Africa and that she had inspired me to do more, she told me I can still make a difference. I made myself a promise that I would do something, whatever I could at least once a year until I retire to make a difference. Last year among several things I organised sending 25 very good working computers from our school to Gambia. 
We can all make a difference.