French astronomer Pierre Janssen first recorded evidence of helium, a then-unknown element.
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President Donald Trump announced that he might want to buy Greenland and claim it for the US.
A great ball of fire was witnessed over the east coast of Great Britain.
Major Gordon Laing became the first non-Muslim to enter Timbuktu.
A funeral was held in Iceland for the loss of the Okjökull glacier.
The USS Indianapolis warship, which sank during World War II, was discovered in the Pacific Ocean 3.4 miles below the surface.
