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.
Protein has the highest thermic effect of food (TEF), which is the amount of calories it takes your body to process and utilize a nutrient. At 20-35 percent, protein has the highest TEF. This means that your body actually uses 20-35 percent of the energy from protein consumed just to digest and absorb it!