The Gandhi-Irwin pact was signed in the year
The cause of Beri Beri was discovered by
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The first thermionic valve was invented by
Who had an explosive idea and first patented DYNAMITE?
Who is often called the 'first African-American' inventor?
Where were wigs first invented?
Who was the first person to patent the JET ENGINE?
What drink was invented by Charles Leiper Grigg in 1929?
Who invented Fountain Pen?
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