Democritus was from Abdera, being the first influential philosopher from mainland Greece, and was born around 460 BCE. He was a prolific writer on many different topics. He argued that there isn't one common element that makes up everything but rather there are these tiny indivisible particles called atoms that are in different shapes and so connect with other types of shapes. These shapes also explained why some things have certain unique properties. A food that tastes bitter might be made of atoms with jagged edges.