Avocados are high in fat. But it's monounsaturated fat, which is a good fat that helps lower bad cholesterol, as long as you eat them in moderation. Avocados have a lot of calories. The recommended serving size is smaller than youâd expect: 1/5 of a medium avocado (or 1 ounce) is 50 calories.
Why do transformers hum? Transformer noise is caused by a phenomenon which causes a piece of magnetic sheet steel to extend itself when magnetized. When the magnetization is taken away, it goes back to its original condition. This phenomenon is scientifically referred to as magnetostriction.
If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some cylinder head work done. Some noise can come from a worn camshaft. It's also a tapping noise. If the noise is a steady metallic rap, it may indicate a rod/rod bearing. A quick steady tap may indicate lifters or cam lobe, while a clatter may be loose/worn rocker arms. A low rumble or knocking noise could be caused by a bad rod bearing on the crankshaft. Here are a couple of sites that will tell you a bit more: 1  http://www.remanufactured.com/Engine_Noi...  http://www.aa1car.com/library/engine_noi....