Aerifying larger lawns requires a power-driven core aerator or aerifier, which can be rented at lawn and garden supply centers. The working parts of these machines are spoon-shaped tines or hollow tubes. As the tubes are driven into the lawn, cores of soil are removed from the ground and strewn across the lawn.
Nutrients with the Highest Energy Density. Fat provides more calories than any other nutrient. The macronutrients -- fat, protein and carbohydrates -- are high in energy density, which means that they have 4 or more calories per gram. The other essential nutrients -- water, vitamins and minerals -- have no calories, so they provide no energy.
14%. A component of more than 70 enzymes, zinc is a key player in energy metabolism and the immune system. Thiamin. 54%. Without this key vitamin, metabolism of carbohydrate, protein and fat would be significantly compromised. Animal protein is one of the best sources of this nutrient, and among the choices, pork is tops. Riboflavin. 19%.