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Who discovered the electron? Which is the longest bone in the human body? At which temperature do both the Centigrade and Fahrenheit show the same reading? Who invented the bifocal lens? Why we do not feel pains to cut our nails? Who invented the jet engine? What is Mach Number? What is the scientific name for study of handwriting? What causes an object to look black? Who discovered insulin? Which element has the highest boiling point? Why does a tennis ball bounce higher on hills than on plains? Which planet has the biggest satellite? How do bats manage to avoid obstacles while flying? Which is the most common of all the metals in the earth's crust? What is the source of caviar? Why does an iron ball sink and not an iron ship? What is herpetology? What is constellation? What is an aardvark? From which plant is morphine obtained? Who discovered the cause of malaria?

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