Yogurt stands in for mayonnaise, and veggies such as celery, onions or bell peppers add a bit of crunch. One serving of egg salad made with two egg whites, 1/2 ounce of plain, fat-free yogurt and 1/4 stalk of celery has 60 calories, less than 1 gram of carbohydrates and 0.5 grams of fat.
The Amazing Inventions of Heron of Alexandria. Heron, also known as Heron of Alexandria, developed many machines and mechanical devices with practical uses, showing that it was possible to take theory and put it into practice. Some of his devices were: 1  A coin operated 'Holy Water Dispenser'. 2  A water organ. 3  The Aeolipile, a steam-powered device.
Egyptian Pharaoh Had Copper Plumbing High-resolution version of this photo. The ancient Egyptians were advanced in many fields including astronomy, construction and irrigation. They were also some of the earliest coppersmiths and made copper vessels, tools and the pipes used for their irrigation systems. It should come as no surprise that they were advanced in matters of indoor plumbing, as well.