Personalized Scientist Chemist Eat Sleep Science Repeat T-Shirt. Science teachers and students will laugh at this eat sleep science repeat design that is great for a biologist, chemist and more Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.