@cleoabram: This is a battery made of sand. It’s a whopping 13 meters tall, 15 meters across, and has 2,000 tonnes of sand in it. It was just installed in a city in Finland to be its primary heat production plant. Here's how it works... The sand is not nearly as efficient compared to the lithium-ion batteries you’re using in your phone. But it's cheap, abundant, and sustainable. And could be a great way to deliver constant energy as we rely more on renewable energy sources. For more optimistic science and tech stories, follow along! #sand #energy #heat #science