Louis Walker

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Make a Waterproof Bike Light from Soda Bottle Caps

This automatic bicycle light from recycled and found parts is about the most eco-friendly DIY bike light in the world. It uses an LED placed inside a plastic bottle cap, which activates when a magnet mounted on the wheel passes a sensor, similar to how a bicycle computer works.<p>If the LED is bright, …

Near-Death Experiences: What Happens in the Brain Before Dying

In the moments before death, the heart plays a central role, conventional wisdom says. That is, as the heart stops beating and blood stops flowing, …

The Brain

A Hacker's-Eye View of the Internet of Things

A study of six consumer-grade smart household devices raises big security questions.<p>Ever wonder what hackers think about the Internet of Things? Consider for a moment what someone with criminal intent might do with secret access to your Internet-connected garage door opener and it doesn’t take long …

Internet of Things

Friday features a total solar eclipse, a supermoon and the spring equinox

The moon is about to block our view of the sun. It’s known as a total solar eclipse and on Friday millions of people in Europe, Northern Africa and …

Hydrogen, hydrogen everywhere...

<b>Hydrogen is the most abundant element in the universe. And when you burn it or use it to produce electricity, the only waste product is water.</b><p>In the era of global warming, it would seem to be the perfect fuel.<p>So why aren't we all driving round in hydrogen-powered cars, moving our goods in …