South Africans are celebrating former President Nelson Mandela's 93rd birthday.
His foundation has urged people to do 67 minutes of volunteering on the day - to represent the 67 years he devoted to South Africa's political struggle.
"If a man could dedicate 67 years of his life to doing good for the world, imagine what we could achieve if everyone just gave 67 minutes of their time to do the same," said Achmat Dangor, the head of the foundation.
South African companies, charities and celebrities have all announced their volunteering plans for the day.
Mr Ban urged others around the world to do the same. "The best way we can thank Nelson Mandela for his work is by taking action for others and inspiring change," he said.
So go on people, have a look on our website and see what you can find to do to celebrate the life and contribution of this amazing man.