Carl Sagan Explains the 4th Dimension

I remember watching this on TV when I was a kid and it blew my mind. It is hands-down the best explanation of four dimensions, curved space, and more – all done in Carl Sagan’s trademark awesomeness.

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Maker Solar

Should You Build or Buy a 5V USB Portable Solar Power Charger?

In this video, GreatScott! takes a closer look at a commercial 5V USB portable solar power charger. After measuring its output power and pretty much “short reviewing” the product, I will try to make my own DIY version that should cost around the same while outputting more power! Let’s get started!

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