1896

Svante Arrhenius, a Swedish scientist that won the Chemistry Nobel Prize in 1903, projected through simple calculations in 1896 that the massive emission of carbon dioxide through industrial processes would ultimately warm the Earth's atmosphere. His work is still a foundational stone of climatology.

700 year-old markings

 I can't stop being amazed at 700-year old stone markings made by masons in a medieval castle. They were engraved during the castle construction, probably by masons that couldn't read or write, but they stood the test of time, as a bridge between a labor-hand and a marketeer that deals with AI, 700 years apart.