In the early days of Bluetooth, devices could only connect if they were within 10 meters (33 feet) of each other — about the length of a school bus!
Inventions And Technology - Facts for Kids
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History & Development
The first basic steam engine was invented by Hero of Alexandria around 60 AD in ancient Egypt — it was called an aeolipile and spun around using steam power!
GPS satellites carry super-accurate atomic clocks that are so precise, they usually gain or lose about one second every 3,000 years!
Firefighters are testing AR helmets that can see through smoke using thermal imaging and show building layouts during emergencies.
AR devices use something called SLAM (Simultaneous Localization and Mapping) which helps them build a 3D map of a room while figuring out where they are in it.