Math puzzles that challenge you to find the missing number are like brain teasers with a numerical twist. They come in many forms, from simple addition sequences with a hidden pattern to complex grids ...

In biology the relationship of what eats what and how energy passes through an ecosystem is called a food chain. Pyramids can help give us an overall picture of a particular food chain. They can ...

Archaeologists in Sudan have reopened an ancient pyramid and extracted bones and artefacts, in order to carry out further examination including DNA tests. The items were found in one of three burial ...