The 19th and 20th centuries were marked by great scientific and technological developments. These developments encompassed many different fields like transportation, communication, manufacturing, education, trade, health care and others.The life of people has become quite comfortable with these scientific innovations as various types of machines have begun to perform complex tasks for them.There was a time when man used to walk long distances to reach other places for trade and other pursuits. The invention of wheel enabled him to make hand-driven and animal driven carts to transport various types of goods to different destinations.With the invention of petrol and the engines that could be used it as fuel came different types of vehicles. Cars, trucks, buses, bikes and other road transport means started being made. This was perhaps the greatest scientific development. People could go to long distances and in large number.They started going to other countries. Not only the trade flourished but also there was cultural development because of interaction of people of different heritages, beliefs, traditions-each influencing the other in some way. Man conquered the oceans with the making of ships, vessels, boats. Going to other continents became easier. Also with the help of large ships the countries could transport large quantities of products to other places for purposes of trade. The fishing trawlers enabled people to get sea-food in large quantities, adding to their food security.The biggest achievement in the field of transportation came in the shape of aeroplanes. The Wright brothers made the first aeroplane and flew on it for a few seconds, but most importantly, they gave the idea of the air transport. The idea was subsequently developed by aeronautical engineers into the making of aeroplanes. Today, air travel is perhaps the most important means of travel for its speed and comfort.A person can have breakfast in India, lunch in London…