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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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Maya reservoirs relied on aquatic plants like water lilies to help keep water clean

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Lidar-derived hillshade image showing map of reservoirs

Enlarge / Lidar map of Tikal, Guatemala, showing some of its reservoirs. (credit: Image adapted Tankersley et al. 2020)

The ancient Maya city of Tikal relied on urban reservoirs to supply water during periods of drought. They essentially built "constructed wetlands" that relied upon key minerals and aquatic plants and other biota to keep the water supply potable, a "self-cleaning" approach similar to that employed in constructed wetlands today, according to a new paper published in the Proceedings of the National Academy of Sciences.

“Most major southern lowland Maya cities emerged in areas that lacked surface water but had great agricultural soils,” said author Lisa Lucero, an anthropologist at the University of Illinois Urbana-Champaign. “They compensated by constructing reservoir systems that started small and grew in size and complexity.”

Like many Maya cities, Tikal was built on top of porous limestone, which limited access to drinking water during the seasonal droughts, which typically lasted five months, although more severe droughts also occurred, particularly in the ninth century CE. So the people of Tikal relied on collecting rainwater stored in reservoirs to survive. They quarried the limestone for bricks, mortar, and plaster, all used to construct buildings on site. The resulting depressions were plastered to waterproof them as reservoirs. Eventually, the Maya built a system of canals, dams, and sluices to store and transport water. It's estimated that Tikal's reservoirs could hold as much as 900,000 cubic meters of water for a population of up to 80,000 people between 600 to 800 CE.

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