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.
Due to the success of cultivating the Nile, Egypt became densely populated and developed a form of writing, hieroglyphics and used papyrus made from the reeds growing on the side of the Nile to make paper to write their history on. The river provided food in the form of fish, and provided the water for agriculture. The Nile was also an important means of transportation for the ancient Egyptians and enabled trade and communication (Hoyt, 2008).