Who invented Space Pen?
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Group of Monuments at Hampi was built by?
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
Which of the following gases is heavier than oxygen?
What is the old name of Singapore?
4 + 16 x -12 x 24 - 13 - 3 ÷ 20 - 4 = ?
'Gallon' is commonly used
∆DEF is right angled at E. If tanD = 4/3, then what is the value of tanF ?