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Competition was fierce at the Rubik's Cube world championship in Brazil. There was a 4-year-old and a category for those who do it with their feet. The overall winner needed less than 6 seconds.

Now, the Centers for Disease Control and Prevention defines a "close contact" as spending a total of 15 minutes within 6 feet of an infected person over a 24-hour period.

The historic first mission to dock a commercial spacecraft at the International Space Station is happening today, and is being webcast around the world.

Known as the "affliction with little dragons," Guinea worm is a nasty parasite that can grow up to 3 feet inside a person. A decades-long campaign to eliminate the worm is starting to pay off. There were only about 500 cases worldwide in 2012, and 89 cases in the first half of 2013.

Nautilus Minerals has signed a contract with the government of Papua New Guinea to extract cooper, gold and silver from a depth of 5,000 feet.

Researchers retrieved reef monitoring devices that had been placed in deep coral reefs in Guam. The devices were placed up to 330 feet below the surface.

The James Webb Space Telescope blasted off from French Guinea at 7:20 a.m. ET on Saturday, Dec. 25. The NASA mission was decades in the making and should reveal the earliest galaxies in the universe.

Now that marijuana is legal in more than 20 states, we all may be exposed to more marijuana on the street. Researchers warn that secondhand smoke from pot poses risks to the heart, lungs and arteries.

How can communities stop coronavirus case surges without crushing the economy? Some scientists say widespread mask wearing may be more than a helpful precaution — it may be the solution.