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1. 
Who is the inventor of the cotton gin? (write a complete sentence)
2. 
What is the cotton gin?
A.
a machine that cuts and plants cotton seeds
B.
a machine that transforms cotton fiber into cloth
C.
a machine that separates cotton fibers from their seeds
3. 
Did the cotton gin reduce the need for slaves?
A.
It reduced the need for slaves to plant and grow the cotton seeds.
B.
It reduced the labor of planting the seeds, but it did not reduce the need for slaves to separate the cotton fibers from their seeds.
C.
It reduced the labor of removing seeds, but it did not reduce the need for slaves to grow and pick the cotton.
D.
None of the above
4. 
How many slaves were needed to cut cotton according to the American Census in 1860?(Write a complete answer)
5. 
What is the equation that facilitated the development of the atomic bomb, involved in the Hiroshima devastation?
A.
Eintein´s equation E = m2c
B.
Eintein´s equation E = mc2
C.
None of the above