The culprit is a molecule called gliadin, which is found in certain gluten-containing grains and causes symptoms in gluten-sensitive people. The grains that cause the greatest problems are wheat, rye, barley, spelt, and kamut; whereas corn, rice, millet, and buckwheat are generally considered safe.
The Forth Bridge's piers are constructed from 120,000 cubic yards of concrete and masonry, faced with 2 ft thick granite. 200 trains use the bridge every day, carrying 3 million passengers each year. The total painted area of the Forth Bridge is 230,000 sq metres, requiring 240,000 litres of paint.
New London Bridge. For the new structure, Rennie proposed five semielliptical stone arches, with the central span reaching 150 feet (46 metres), the next two 140 feet (43 metres), and the two shore spans 130 feet (40 metres). Rennie died in 1821 before work began, and the job was left to his two sons.