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Heating Buildings With Solar Energy Stored in Sand

Cars That Think

As we try to objectively study nature, we are often reminded of how natural forces affect us personally. When we turn up the heat in our homes and workplaces, we must balance our personal need for warmth with the global impact of burning fossil fuels like oil, gas, coal, and biomass. The apparent contradictions do not end there.

Store 80
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Build Your Own Hi-fi Ear Defenders

Cars That Think

For years, I have been trying to improve my personal audio-monitoring situation without going to the expense of the systems used by professional touring bands, which include custom-molded earpieces. I was on the hunt for another cheap small MEMS mic that could handle louder sound sources.

Building 105
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On National Golf Cart Day (seriously), here’s 10 ways they beat cars

Baua Electric

These smaller, more efficient alternatives to traditional cars might just be a good choice for your ‘second car’, believe it or not. And with many golf carts available for a small fraction of the cost of a new electric car, this is one of the most cost-effective ways to get into a four-wheeled electric vehicle.

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Just Calm Down About GPT-4 Already

Cars That Think

Brooks, who is now working on his third robotics startup, Robust.AI , has written hundreds of articles and half a dozen books and was featured in the motion picture Fast, Cheap & Out of Control. When are we going to have full (level-5) self-driving cars? Or, how far can a person throw a Frisbee? Can they throw it 10 miles?

Personal 145
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IoT-ize Your Old Gadgets With a Mechanical Hijacking Device

Cars That Think

KAIST/Korea Polytechnic University The paper doesn't directly address the cost of the MHD, and with three motors and some other electronics in it, it's not likely to be super cheap. It's also possible to build your own MHD device for cheap , if you know what you're doing.

DIY 135
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We Don’t Need a Jetsons Future, Just a Sustainable One

Cars That Think

What if, instead of self-driving cars, digital assistants whispering in our ears, and virtual-reality glasses, we viewed a technologically advanced society as one where everyone had sustainable housing? Where everyone had access to preventative health care that was both personalized and less invasive? Take space travel as an example.

Future 109
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Hi-fi, Radio, and Retro: The DIY Projects Spectrum Readers Love

Cars That Think

Far and away our most popular article in the last five years has been “ Build Your Own Professional-Grade Audio Amp on the Sort of Cheap ” (November 2018). And a follow-up to that article, “ A Web-Enabled, High Quality, DIY Audio Amp ” (March 2022), comes in at No.

DIY 69