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When were wheels added to suitcases?

“Bernard Sadow patented the wheeled suitcase in 1972, around 5,000 years after the wheel was invented.”

Reference: The New York Times

What are the different types of laptop batteries?

There are currently three types of batteries commonly used to run people's laptops:
1) Nickel Cadmium (Ni-Cd) batteries were the standard technology for years, but are now out of date.

2) Nickel Metal Hydride (Ni-MH) batteries are a cadmium-free replacement for Nickel Cadmium.
3) Lithium Ion (Li-ion) is the battery you want for your laptop and is the current standard for portable power.

When was the wheel invented?

The wheel was invented around 3500 BC in Mesopotamia, and it was first used as a potter's wheel for making pottery before anyone put it on a vehicle.

How many people use the internet?

About 5.5 billion people, roughly two-thirds of the world's population, use the internet, according to the International Telecommunication Union.

Another fact

“Bernard Sadow patented the wheeled suitcase in 1972, around 5,000 years after the wheel was invented.”

More from this shelf

What are the different types of laptop batteries?

When was the wheel invented?

How many people use the internet?