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.
Ancient Egyptians also learned to fish in the Nile for the large fish that lived there. They built irrigation systems from the River Nile for use of bathing water, drinking water, and to water their crops. It was one of the most important things in Egypt at the time.ncient Egyptians also learned to fish in the Nile for the large fish that lived there. They built irrigation systems from the River Nile for use of bathing water, drinking water, and to water their crops. It was one of the most important things in Egypt at the time.