Personalized Nanotechnology Toddler Long Sleeve T-Shirt. Nano Technology is huge text with a magnifying glass on Toddler Long Sleeve Tee - Black make a funny science gift design for engineers, scientists and technicians working with the smallest structures. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.