There is a real answer to this one, but it is not politically correct. I lived in Africa for more than 40 years.
Pliny was wrong, there is not always something new out of Africa. That's the problem. Africa stayed where it was for millenia - they didn't invent an alphabet and written language, neither did they make use of wheeled transport except in isolated cases. These are two of the corner stones of any technological society. Engineering is based on mathematics. Another discipline Africa knew nothing of.
Look at the facts. Then find an answer that fits the facts. If newer facts force one to update or abandon one's answer, so be it.
Statistically, any society needs a certain percentage of its population that is mentally agile. These people will be responsible for the bulk of all the advances of that society. I don't know what that percentage is - my guess is 10 - 15%. Africa does not have the required number of these achievers able to lift the whole society. And that's it.
Africans are not responsible for this state of affairs. None of us made ourselves.
Pliny was wrong, Abu Tib was right: in Africa the man with the gun will always be boss. Don't expect too much of Africa. After all, it is Africa.
Because they do not need charity, they inspiration. Charity only send them a loaf of bread to keep them alive in their wretchedness or give them an entertainment to make them forget for few hours or days. so if we want to help them we have to inspire them or demonstrate them that how they can become rich.
Untitled Decades Project - 2012 was released on: USA: 2012
The cast of Designing the Decades - 2003 includes: Penelope Keith as Narrator
The Chipmunks Rockin' Through the Decades - 1990 TV was released on: USA: 9 December 1990
Decades Rock Live - 2006 Cyndi Lauper and Friends was released on: USA: 3 February 2007
Hans Haacke 4 Decades - 2007 was released on: USA: 2007 (International Festival of Films on Art)
Jari Litmanen (Finland) (1989 - 2010)
Slowly - Even the genocides in the last few decades have happened without the international community being able to prevent them.
Cold war was a significant period of our recent history that shaped the international relationships for many decades.
One of the most reliable international tractors is Case IH. The company has been around for decades and is sold in several countries. It is also made in the USA. Which to me makes it even better.
4.5 decades equals 4.5 decades!
Probable one of the best international tractors is Case IH. They are bought in several countries and their made in the USA. It is better made too. They also have been around for decades.
No, you don't need a hyphen. It would be 10 decades or ten decades.
100 decades in a millennium
There are 3.5 decades in 35 years