Necessity is the mother of invention.” This quote is commonly used to explain how another miraculous invention was discovered. Throughout history, many inventions have been created. The Industrial Revolution started in the late 1700s, and since then humankind has been developing at an exponential rate. Truly amazing and useful devices, such as the steam engine and telegraph, were invented. In the last 100 years, many inventions and innovations have been created that make society’s life better, and four devices stand out as the most useful: the jet airplane, the television, the laptop computer, and the cell phone.

The first most useful invention is the airplane, invented in 1903 by the Wright brothers. The airplane has transformed not only this society, but also the entire world. Airplanes make it possible to travel long distances in a few hours, whereas before it took days or weeks to travel by horseback. In fact, a plane enables people to travel over high mountains and deep oceans with ease. It is as if the Atlantic and Pacific Oceans were small rivers and the Himalaya and Rocky Mountains were tiny hills to jump over. In addition, with the invention of the plane, the world is smaller because a person can now effortlessly travel from one country to another to work, study, or take vacations.

The second most important invention in the last century is the computer, and specifically the laptop computer with an internet connection. The computer was invented in the mid-1900s, but in the 1980s the personal computer transformed how people use it. Because a laptop computer is small, portable, and can store large amounts of data, it is useful for business and study. From email to ecommerce and from ebooks to downloading movies and games, the personal computer has transformed everyone’s life. Computer software programs make it possible to keep track not only of business