MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 295
The first user who solved this task is Fazil Hashim.
#brainteasers #math #riddles
Cotton ginIn 1794, Eli Whitney was issued a U.S. patent for his cotton gin. His invention replaced much processing by hand labour, and revolutionized the textile industry. Cotton became commercially important in the southern US, with a resulting demand for slaves to tend the fields and harvest the cotton crops.[Image: detail from copy of Whitney's patent made by the Patent Office in 1845.] |