Compose an Incredibly Lifelike Instagram Post

Compose an incredibly lifelike Instagram post featuring Albert Einstein marking the accomplishment of the theory of relativity. The image should showcase a close-up selfie of Einstein grinning, his hands smudged with chalk. Papers covered in handwritten equations should be scattered across the desk, while a chalkboard is prominently displayed in the background. Ensure Nikola Tesla's comment with a lightning bolt emoji is clearly visible.