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Scientists have previously hypothesized that spots are conferred at random or that they are influenced by environmental factors.

McConnell told reporters that the CIA "basically certified" Saudi involvement at high levels in the killing of journalist Jamal Khashoggi — breaking with President Trump, who said it was unclear.

Over the long weekend, President Trump aired several grievances, the federal government published a report on global warming and U.S. border agents fired tear gas at migrants at the border.

Many students at the University of North Carolina-Chapel Hill are dissatisfied with a university proposal to display a confederate statue in a new history building. The statue was toppled in August.

Lawmakers have agreed to send rejected refugees or those with criminal records to an uninhabited island once used to test diseased animals.

The economy continued to add jobs at a steady pace last month and the unemployment rate remained low. Analysts have been looking for signs that wage growth might pick up, but it held steady, too.

Ireland has been plagued by sexual abuse scandals involving priests. The pope's visit comes as the Catholic Church faces multiple sexual abuse scandals across the world.

A mini biosphere was sent up in China's Chang'e-4, which landed on the far side of the moon in early January. Photos show the small, green shoot of a cotton plant in a container aboard the spacecraft.

After nearly a decade of traveling through space, NASA's New Horizons probe is about to arrive at Pluto. On Tuesday it will begin an intensive, weeklong study of the distant world.

Octopuses are cool. They can regrow lost arms, change the color of their skin, and are surprisingly smart. Scientists who sequenced the first octopus genome say it's nearly as big as a person's.