Well, The largest proportion of federal revenue comes from the personal
income taxes. From more than 60 years, It has been the largest source of
the federal revenue. Around 43% of the federal revenue comes from
Income tax and around 35% revenue comes from Payroll taxes. Common
people give more contribute to the economy.
b. Ibn Sina collected medical knowledge into a
book that was used for centuries in Europe. Also known as Avicenna who
known to be the Prince of Physicians.
c. Few people outside the Arabian Peninsula knew
of the wonders of Muslim medicine. They knew how to treat small pox and
tuberculosis. They also had knowledge on
surgery.
The US defeat of pirates in The Mediterranean
(I think so!)