Apple originally positioned the Apple Watch as being about three things: productivity, communication, and fitness. While the device can indeed help in all three areas, it quickly became apparent that its core appeal was helping people reach health and fitness goals.

Some years back, my coll

By David Ferris | 10/18/2022 06:34 AM EDT

People ride shared, dockless electric scooters along Venice Beach in California in 2018. Mario Tama/Getty Images Electric Trike

It used to be hard to dump enough electricity through two pieces of metal to meld them together. But a lithium-ion battery can do it. The question is, should it? [The Signal Path] takes a cheap battery-based spot welder apart to see what’s inside and tries to answer that question. You can s

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