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Amazon is offering the SiriusXM Roady BT In-Vehicle Satellite Radio Kit for $69.99 shipped. Down 30% from its normal going rate at Amazon, today’s deal marks a new low that we’ve tracked there and is also the first discount all-time at the retailer. Designed to deliver in-vehicle entertainment, the Roady BT satellite radio installs in your car and connects to your stereo through Bluetooth, 3.5mm aux, or over a built-in FM transmitter. You can choose to mount it via a magnetic vent or dash adapter and there’s an additional mounting system that’s sold separately should you need it. Plus, it comes with a three month free trial of Sirius XM or you could opt for 12 months of the brand’s Platinum Programming Package for $99. Keep reading for more.

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The post SiriusXM Roady BT in-car satellite radio kit lets you tune in anywhere for $70 (First sale) appeared first on 9to5Toys.

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Study reveals how natural processes helped sculpt the Great Sphinx of Giza

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Frontal view of the Great Sphinx of Giza in Egypt

Enlarge / Experiments yield fresh evidence to support controversial hypothesis about the formation of the Great Sphinx of Giza. (credit: MusikAnimal/CC BY-SA 3.0)

Leif Ristroph, a physicist and applied mathematician at New York University, was conducting experiments on how clay erodes in response to flowing water when he noticed tiny shapes emerging that resembled seated lions—in essence, miniature versions of the Great Sphinx of Giza in Egypt. Further experiments provided evidence in support of a longstanding hypothesis that natural processes first created a land formation known as a yardang, after which humans added additional details to create the final statue. Initial results were first presented last year as part of the American Physical Society's Gallery of Fluid Motion, with a full paper being published this week in the journal Physical Review Fluids.

"Our results suggest that Sphinx-like structures can form under fairly commonplace conditions," Ristroph et al. wrote in their paper. "These findings hardly resolve the mysteries behind yardangs and the Great Sphinx, but perhaps they provoke us to wonder what awe-inspiring landforms ancient people could have encountered in the deserts of Egypt and why they might have envisioned a fantastic creature."

In 2018, Ristroph's applied mathematics lab fine-tuned the recipe for blowing the perfect bubble based on experiments with soapy thin films, pinpointing exactly what wind speed is needed to push out the film and cause it to form a bubble, and how that speed depends on parameters like the size of the wand. (You want a circular wand with a 1.5-inch perimeter, and you should gently blow at a consistent 6.9 cm/s.)

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