Albert Einstein, age 26, submitted "Concerning an Heuristic Point of View Toward the Emission and Transformation of Light" to Annalen der Physik #OTD in 1905.
His paper explained the photoelectric effect by asserting the reality of quanta. 🧪 ⚛️ 🎢
onlinelibrary.wiley.com/doi/epdf/10....
