Definition - What does Positive Displacement Pump mean? Positive Displacement Pump is a type of pump used to displace or force oil and petroleum products into pipelines or into various equipment installed in refineries.
A brain looks like a walnut because our minds are constantly making comparisons and finding similarities to help us understand the world around us. Here's an activity that can help you see more such things. Try to find faces.
Here are some of the health benefits of eating walnuts: 1  Walnuts have long been known to reduce the risk of heart disease and some cancers. They are one of the best foods to prevent clogged arteries.  They minimize the signs of aging and they are also one of the top 10 foods against wrinkles.