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.
Sea Arches - The Green Bridge of Wales. The Green Bridge of Wales is one of the most famous landmarks in Wales, and one of the most spectacular sites on the Pembrokeshire Coast. It is located close to Castlemartin in the south of the county, and is adjacent to the Stack Rocks and the Cauldron. The Green Bridge is a limestone arch. It is the limestone of the South Pembrokeshire Coast that is responsible for some of the most beautiful natural features. The arch formed when the sea wore away the rock underneath. Once the arch was a promontory of rock, jutting into the sea.