A common type of machine for the vending of bottled drinks is the Cartesian-drive machine shown below. Here, a carriage for the drink bottles moves from a starting point on the lower left side of the ...

Every animal and plant needs food to live, and they are all part of a food chain. A food chain shows how animals obtain their food. A food chain also shows the flow of energy, which starts off at the ...

Around 2,500 years ago, the city of Rome was at the centre of a huge empire that stretched from Scotland to Syria. The Roman Empire was based upon enslaved people and citizens. Enslaved people were ...