Why do people say that Arabs never invented anything and are poor?

Arab countries are some of the wealthest by GDP per capita,
Source:
http://en.wikipedia.org/...per_capita

Furthermore Kuwait has a median income of 40,000, Qatar $27,000, Bahrain and Saudi Arabia each have about $25,000, median income (Source:
http://www.gallup.com/poll/166211/worldwide-median-household-income-000.aspx ) but they have unemployment rates of 4% or under while the EU has an unemployment rate of over 10%. The EU also has less economic growth and Europe as a whole has about $20,000 median income ].

Bricks were originally invented in Egypt, the first glass was found in the middle east.
Source: http://en.wikipedia.org/...y_of_glass
Scissors were invented in Egypt:
http://inventors.about.com/library/inventors/blscissors.htm

The inventor of Algebra was ibn, who was Arab.

The first comb was found in Persia
Source:
http://en.wikipedia.org/.../wiki/Comb

Why do people say that Arabs never invented anything?

Added (1). Also Steve Jobs invented the iphone, Ipad and Ipod and he was half Arab.

And for all you idiots who don't know what "median" is, it is the middle 50th percentile of the income population, not average, so the top 10% or what ever make no effect on it.

Arabs invented nothing. Fact