The element Hydrogen is represented in the periodic table by the symbol "H". "H" in Arabic is "هـ". The sun is predominantly made of "هـ". It turned out that all verses of chapter "The Sun" end with "هـ". In fact, the chapter "The Sun" is the only chapter in the Quran whose verses all end with the symbol for Hydrogen. Quran Chapter "The Sun"
For centuries, Egyptologists and geologists thought that the Egyptian pyramids were made of limestone blocks (up to 70 tons) that were quarried by chiseling limestone. Workers then carried those blocks up the pyramids on ramps. This building procedure was thought to be so superhuman that it made the pyramids become one of the Seven Wonders of the World. However today electron microscopes revealed that the blocks at the top have chemistries found nowhere in nature. Those blocks at the top must have been baked and then cast like modern cement (not chiseled from existing limestone or not natural limestone). However 1400 years ago the Quran said that Pharaoh used baked clay: Quran 28:38
1400 years ago people knew that honey was very viscous. However it was impossible for them to tell which is more viscous water, wine or milk. The least viscous is water, milk, wine then honey. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered. Paradise has rivers of water, milk, wine and honey: Quran 47:15. Rivers are flowing liquids. Those liquids are arranged by the correct viscosity order: water, milk, wine then honey.
If iron is exposed to oxygen and water it will eventually convert to rust and disintegrate. To prevent rust you have to block the oxygen or water. One of the used methods is to coat the iron. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered. In the story of Thu-Al-Karnain he poured tar over the iron. Quran 18:96