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When did the first jet airplane fly?

“The first jet-powered airplane to fly was Germany's Heinkel He 178 in 1939, though British engineer Frank Whittle had patented a jet engine design in 1930.”

Reference: Britannica

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1) Nickel Cadmium (Ni-Cd) batteries were the standard technology for years, but are now out of date.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.

What is the "blackbox" recorder for?

An airplane's "blackbox"' is a device which records conditions and events on an air vessel. A "blackbox" is actually orange in color to make it more visible in the wreckage.

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

“The first jet-powered airplane to fly was Germany's Heinkel He 178 in 1939, though British engineer Frank Whittle had patented a jet engine design in 1930.”

More from this shelf

What are the different types of laptop batteries?

What is the "blackbox" recorder for?

How many people use the internet?