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Science news this week: Strange signals from space and Earth's leaking gold

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Astronomers discover mysterious object firing strange signals at Earth every 44 minutes .

Scientists discover the oldest known human fingerprint from a 2.2 million - year-old tooth enamel.

A new study suggests that Earth 's core may be "leaking" gold and precious metals from its core.

A critical "inflection point" could be reached in the next 30 years , an astronomer says.

Such "episodic" fountaining has not been seen since the eruption of Pu'u '' in the 1980s .

The volcano has also released thousands of tons of toxic sulfur dioxide and strands of windblown volcanic glass.

As it erupts, the volcano poses a significant threat to human health.