An equation is a mathematical expression that contains an equals symbol. Equations often contain algebra. Algebra is used in Maths when we do not know the exact number in a calculation - this unknown ...

A visual puzzle challenges you to find a hidden inverted '83' among many inverted '82s'. This test measures your speed and attention to detail. Spotting the difference quickly shows strong pattern ...

In 1982, a 21-year-old Chris Espinosa faced a familiar challenge in software design: satisfying Steve Jobs’ exacting eye.