Science

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The STAR detector at Brookhaven National Laboratory. This week, a team of researchers from the Brookhaven National Laboratory announced they had discovered helium's twin particle, antihelium-4, the heaviest antimatter nucleus observed yet. So what does that mean, and why do…

Earth Day was first celebrated on April 22, 1970, one year after an oil spill off the coast of Santa Barbara, Calif. leaked 100,000 barrels of oil into the ocean. At the time, it was the largest oil spill in…