Personalized Microbiology Professor Funny Job Gift Long Sleeve T-Shirt. Microbiology Professor Long Sleeve T-Shirt - Charcoal has occupation humor quote that says There are two kinds of people in this world and being a Microbiology Professor is better than both of them. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL