Cellulose is a type of carbohydrate that forms the cell wall of green plants and is a major component of dietary fiber which humans, including thirteen-year-olds, ingest through consuming plant-based foods. However, unlike some animals, humans do not have the enzymes necessary to break down cellulose into its glucose units and derive calories from it. Therefore, while 13-year-olds can ingest cellulose by eating vegetables, fruits, and grains, their bodies utilize it to aid digestion, promote regular bowel movements, and help maintain a healthy gut, rather than as a direct source of energy. Ensuring a diet rich in a variety of plant-based foods can help in meeting the recommended intake of dietary fiber, thereby providing enough cellulose for health benefits.

While you cannot directly print on a shirt using a standard inkjet printer due to the printer's design and the material of the shirt, there is a creative workaround. This involves printing your design or text onto special iron-on transfer paper designed for inkjet printers. Once you have your design printed on the transfer paper, you can then iron it onto your shirt following the transfer paper's specific instructions. This method allows for custom designs on shirts at home with the equipment you likely already have. However, the durability and quality of the print can vary based on the transfer paper and shirt fabric quality, so it's important to follow the instructions carefully and perhaps test on an old shirt first.

PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) are both popular plastics used in piping and plumbing. The main difference lies in their heat and chemical resistance. CPVC is chlorinated, providing it with a higher temperature tolerance (up to 200°F) compared to PVC, which is typically rated for temperatures up to 140°F. This makes CPVC suitable for hot water lines, whereas PVC is commonly used for cold water and sewer applications. Additionally, CPVC can handle a wider range of chemicals, making it a preferred choice for industrial applications. Despite these differences, both are lightweight, easy to install, and corrosion-resistant. Choosing between them depends on the intended use, temperature, and chemical exposure of the piping system.