Special Relativity T-Shirt for Mathematicians Physicists-TH

Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 65% Cotton, 35% Polyester, Imported, Machine wash cold with like colors, dry low heat, Time dilation formula tee shirt for teachers, students, scientists studying mathematics, theory, space, general relativity. Wear this tshirt to class, college, school, the laboratory, the lab, cern, while teaching, studying, or lecturing. Lightweight, Classic fit, Double-needle sleeve and bottom hem