Ukrainian President Volodymyr Zelenskyy refused to sign an agreement to grant the United States 50 percent of all future reserves of rare earth metals in Ukraine, according to news reports following a ...
Humans evolved late in Earth history. While this timing inspired the conclusion that humanlike life is a cosmic improbability ...
The cool conditions which have allowed ice caps to form on Earth are rare events in the planet's history and require many ...
Throughout Earth's history, ice caps have been very rare, but a model of the past 420 million years suggests an explanation ...
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