1 . Remote controls are one of the most common symbols of our modern technologies. In fact, remote controls are an invention born in the 1800s. Famous inventor Nikola Tesla created one of the world’s first wireless remote controls, which he exhibited in public at Madison Square Garden in New York City in 1898.

Tesla called his system a “teleautomaton”, which could be used to control a mechanical device. For his demonstration, Tesla employed a minitype boat, which had a metal air wire that could receive exactly one radio frequency. He showed how his remote-controlled boat worked and whole process attracted many people. However, financially, Tesla’s remote-controlled boat was a failure. His intended client, the U.S. Navy, thought the technology was too easily damaged during use. But the concept of remote control caught on and quickly spread to many other types of equipment.

In the 1930s and 1940s, a new consumer electronics, such as garage door openers and model airplanes, arrived with remote controls. In the mid-1950s, Zenith engineer Eugene Polley designed his Flashmatic TV remote control, which used directional flashes of light to control the television. In 1956, Polley’s colleague, Robert Adler, created the Space Command control, which employed high-frequency, ultrasonic (超声的) sounds instead of light. This style of remote control increased the price of a new TV by a third, but that didn’t stop people from buying in mass quantities. Remote controls kept evolving, too. Ultrasonic sound remote controls were the standard for TVs until the 1980s, when remote controls began using the infrared (红外线) light signals that are very common today.

These days, you can find remote control capability built into a huge array of products such as toy cars and helicopters, video game consoles (控制台), ceiling fans, etc. There’s a good chance you can find a version that’s controlled by remote control. You can even buy a remote-controlled toilet.

Remote controls have allowed humans to perform many tasks that would be difficult, if not impossible. And although remote controls have a long history, they are anything but over. As we continue to introduce technology to every aspect of our lives, it’s very likely that we’ll need remote controls to keep things under control.

5 . A study of art history might be a good way to learn more about a culture than is possible to learn in general classes. Most typical history courses concentrate on politics, economics, and wars. But art history focuses on much more than this because art reflects not only the political values of a people, but also religious beliefs, emotions, and psychology. In addition, information about the daily activities of our ancestors ― or of people very different from our own ― can be provided by art. In short, art expresses the essential qualities of a time and a place, and a study of it clearly offers us a deeper understanding than what can be found in most history books.

In history books, objective information about the political life of a country is presented: that is, facts about politics are given, but opinions are not expressed. Art, on the other hand, is subjective: it reflects emotions and opinions. The great Spanish painter Franciso Goya was perhaps the first truly political artist. In his well-known painting The Third of May, 1808, he criticized the Spanish government for its misuse of power over people. Over a hundred years later, symbolic images were used in Pablo Picasso’s Guernica to express the horror of war. Meanwhile, on another continent, the powerful paintings of Diego Rivera, Jose Clements Orozco, and David Alfaro Siqueiros ― as well as the works of Alfredo Ramos Martinez ― showed these Mexican artists’ deep anger and sadness about social problems.

In the same way, art can reflect a culture’s religious beliefs. Four hundreds of years in Europe, religious art was almost the only type of art that existed. Churches and other religious buildings were filled with paintings that depicted people and stories from the Bible. Although most people couldn’t read, they could still understand biblical stories in the pictures on church walls. By contrast, one of the main characteristics of art in the Middle East was (and still is) its absence of human and animal images. This reflects the Islamic（伊斯兰教的）belief that statues are unholy（不神圣的；亵渎的）.