7 Best Christmas Tree Stands in 2022

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Believe it or not, a Christmas tree won't stay upright on its own. Instead, you need a stable Christmas tree stand that can accommodate the type and size of tree you have. We researched dozens of the best Christmas tree stands to help you find the right one for your needs, whether you have a real tree, an artificial tree, a small tree, or a behemoth. The stands in our guide have a track record of durability, performance, and easy setup. We also outline the size and type of tree each stand is meant for. Check out our guide to the best Christmas tree skirts once you've chosen the right stand for your tree. The best Christmas tree stands in 2022 Best Christmas tree stand overall: Krinner Tree Genie Christmas Tree Stand, available at Amazon, $82.79 The German-engineered Krinner Tree Genie Christmas Tree Stand is easy to set up in a couple of minutes and keeps trees up to 12 f...
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Plastic 'Pac-Man' moves using water ripples

A simple device made of plastic and rubber can be controlled using ripples in water to move around obstacles

Technology 30 November 2022

By Karmela Padavic-Callaghan

[embed]https://www.youtube.com/watch?v=SFhf23R-jtQ[/embed]

A small device shaped like Pac-Man can move on the surface of water and around obstacles without a motor. It could lead to the development of small robots for environmental monitoring of lakes and rivers.

Daniel Harris at Brown University in Rhode Island and his colleagues built little devices made of plastic and rubber that can be moved in a controllable way by ripples in water.

The researchers first looked at how five-pointed stars, between 0.6 and 1.1 centimetres in size, move when floating in a tank of water. Ripples produced at the surface by a separate oscillating device caused …

https://www.tausiinsider.com/plastic-pac-man-moves-using-water-ripples/?feed_id=331754&_unique_id=6457a3e1dc1be

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