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Trebek returned to filming episodes of in mid-January after surgery to treat a subdural hematoma — blood clots on the brain — caused by a fall in October.

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Lahn offers an analogy: Medieval monks would copy manuscripts and each copy would inevitably contain errors — accidental mutations.If those genes don't work, babies are born with severely small brains, called microcephaly.Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency.Bae has also taken on a wider meaning, being used to label something as generally good or cool, as in “This sandwich is bae.” , it’s likely that the meaning will shift in any case.When words get popular, one of two things tends to happen, as computational linguist Tyler Schnoebelen explains: “As it gets picked up by more people, its meaning will either calcify or bleach.” That is, harden into meaning only one very specific thing, or expand to embrace a range of meanings.Those criticisms are particularly important, Collins said, because Lahn's testing did find geographic differences in populations harboring the gene variants today.They were less common in sub-Saharan African populations, for example.“It is premature at this time, before we even have a Republican opponent, to talk about debates.” Trebek told the Hill in 2013 if he were afforded the opportunity to moderate a political debate, he would take a different approach.“I would not let the politicians get away with standard responses,” Trebek said.Aside from not knowing what the gene variants actually do, no one knows how precise the model Lahn used to date them is, Collins added.Lahn's own calculations acknowledge that the microcephalin variant could have arisen anywhere from 14,000 to 60,000 years ago, and that the uncertainty about the ASPM variant ranged from 500 to 14,000 years ago.

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