A right angle is a square-shaped or L-shaped angle, and measures 90 degrees (a quarter of a circle). A square is made up of four right angles. Make a Right…

Desalination means taking the salt out of salty water (from lakes or the sea) to make fresh, drinkable water. How Does Desalination Work? The two main ways to remove the…

Paper is used for a great many things, from paper towels and tissues through sheets of paper for printing at home or work, to special paper for banknotes, and each…

Mathematicians use mathematical proofs to prove that what they say about numbers is true. Some proofs look true but aren’t – these are known as fallacies. Here are a few…

Condensation, on the inside of the kitchen window on a chilly morning or on a cold glass of water, and dew on the grass on a cool autumn evening, is…

Plants grown from seeds, from the smallest (an orchid, at 85 micrometers long) to the largest (the Coco de Mer palm, at about 30 cm long). Seeds are amazing things…

Knowing the times tables is helpful to be able to do mental arithmetic. But it is also useful to have some other tricks to help with multiplying. In these experiments,…

Like animals and humans, plants need water, air and food to grow. They get all of these from their growing medium – the compost or soil that they grow in….

The golden ratio (also known as the golden section or golden mean, or as the Greek letter ‘phi’) describes a rectangular shape that people find an attractive shape, particularly in…