All matter is in pairs.
Until 100 years ago it was thought that only man and animals were made in pairs (males and females). However the Quran said that everything from which the land produces, man and what they could not see were also made of pairs. Today we know that all matter is in pairs: matter and antimatter (electrons and positrons, quarks and antiquarks...)
[Quran 36.36] Glory to Him [Allah], Who created in pairs all things that the land produces, and their own kind (humans) and other things of that they have no knowledge of.
How could an illiterate man who lived 1400 years ago have known that matter is in pairs?