Who invented the Hot Air Balloon?

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What is the mass of the Sun?

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Dengue Fever is also called___________?

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Which Planet has purple rocks according to NASA ?

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Approximate age of sun is _________?

A. 4.4 billion years B. 4.5 billion years C. 4.6 billion years D. 4.7 billion years...

Instrument that measure the electric force ________?

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