When you walk or run, your body uses only the slow-twitch muscle fibres to drive

The black and white stripes on things you buy at shops are called a barcode.

The weather and rainfall patterns are changing because the Earth’s temperature is rising and the

Magnets are found everywhere— hard drives that store data on your computer are coated with

A tree’s roots cannot grow after the tree is cut down because roots need nutrients

A fitness tracker is a small gadget that you wear on your wrist, like a

Blinking is the quick closing and opening of eyelids. It takes up to 400 milliseconds

A vending machine is an automated machine that gives you snacks and drinks without needing

Using more clean sources of energy like sunlight, wind and water instead of burning coal

Airports have a big system of conveyor belts to move bags from check-in to the