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.
The Church was being challenged as the fountain of wisdom and the center of authority. An important aspect of the advances made in science in the 17th century was the invention of instruments of measurement.The Dutch glass industry was responsible for developing the necessary skills to produce polished lenses needed for fine microscopes and telescopes.he Church was being challenged as the fountain of wisdom and the center of authority. An important aspect of the advances made in science in the 17th century was the invention of instruments of measurement.