We're all familiar with the high-pitched squeak of basketball shoes on the court during games, or tires squealing on pavement. Scientists conducted several experiments and discovered that the geometry of the sneakers' tread patterns determines the squeak's frequency, enabling the team to make rubber blocks set to specific frequencies and slide them across glass surfaces to play Star Wars' "Imperial March."
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The two most popular explanations of origin are that the belief goes back to pagan times when we believed in tree spirits, or that we are invoking Christ’s protection by referring to the wood of the Cross. The former is nothing but guesswork, based on the conviction that all superstitions must be ancient, and it has the usual problem of spanning thousands of years with no evidence at all of its existence, or, for that matter, any evidence that ‘we’ ever believed in tree spirits.
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Before Apple announced the new MacBook Air on Tuesday, the M4-powered MacBook Air was the model we recommended for most people. Even with the introduction of the cheaper MacBook Neo, the Air is still the better choice if you want more power. We haven’t tested the new M5 version yet, but the changes between the two Air models appear relatively minor on paper, so the overall experience is likely to feel very similar. No matter which MacBook Air you choose, you’ll get a thin, lightweight laptop that’s more than powerful enough to handle everyday work and play, and even some light gaming or video editing. Both also offer excellent battery life that should easily last well over a full workday, along with a 12-megapixel Center Stage webcam.