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Dipanjana Mukherjee Gavin Alexander Bir Singh Dipanjana Mukherjee Gavin Alexander
Project loon high-altitude balloon.
Trepanation
Champawat Tiger
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'Oumuamua
Supervoid
Pale Blue Dot.
Global positioning system.
Day length fluctuations.
John Stapp being propelled in a rocket powered sled.
Sea Shadow IX-529
Bibi Ka Maqbara.