(Credit: Amazon) Instead of plastering the ceilings of stores full with cameras, it seems that Amazon instead wishes to focus on smart shopping carts that can keep track of what has been put ...

The modern shopping cart — as we know it — didn't always exist, which meant it had to be invented. The How Curious podcast explores the history of the shopping cart.

Shopping carts are surprisingly expensive. Prices range up to about $300 for a cart, which may seem like a lot, but they have to be pretty rugged and are made to work for decades. Plastic carts ...