Albert Einstein, relativity sand

Albert Einstein  was a German-born theoretical physicist. He developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).^[He is best known in popular culture for his mass–energy equivalence formula E = mc² (which has been dubbed "the world's most famous equation").^[He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect unique handmade with sand