Many animals recognize their food because they see it. So do humans. When you see an apple or apiece of chocolate you know that these are things you can eat. You can also use other senses when you choose your food. You may like it because it smells good or because it tastes good. You may dislike some types of food because they do not look, smell or taste very nice. Different animals use different senses to find and choose their food. A few animals depend on only one of their senses, while most animals use more than one sense.

Although there are many different types of food, some animals spend their lives eating only one type. The giant panda eats only one particular type of bamboo. Other animals eat only one type of food even when given the choice. A land of white butterfly will stay on the leaves of a cabbage, even though there are plenty of other vegetables in the garden. However, most animals have a more varied diet. The bear eats fruits and fish. The fox eats small animals, birds and fruits. The diet of these animals will be different depending on the season.

Humans have a very varied diet. We often eat food because we like it and not because it is good for us. In countries such as France and Britain, people eat foods with too much sugar. This makes them overweight, which is bad for their health Eating too much red meat and animal products, such as butter, can also be bad for the health Choosing the right food, therefore, has become an area of study in modern life.

Researchers say they have developed technology that could predict heart attacks years before they happen. They report using mathematical systems to examine CT images of a patient’s heart. A CT scan uses X-rays and a computer to make detailed pictures of bones, organs and other tissue inside the body.

The new method was developed by researchers at the University of Oxford in England. A report on their study was published in the medical journal The Lancet. Also taking part in the study were teams from Germany and the US.

Most heart attacks result from a build-up of fatty tissue inside arteries（动脉）that carry blood from the heart to other areas of the body, thus blocking this flow of blood and causing a heart attack.

Currently, doctors use CT scans to learn when a sticky substance called plaque has already built up inside an artery. The new technology is designed to predict which arteries are at risk for future buildup.

The researchers reported using computers to examine CT scans to measure how much fat is present around heart arteries. That fat changes when an artery becomes affected, serving as an early warning system for heart attacks.

Charalambos, a professor at Oxford University, said he believes the research shows this method could be very effective in getting patients to take early steps to prevent future problems, adding that researchers had yet to estimate exactly how many heart attacks could be prevented. But he said he believes the technique could help identify between 20 to 30 percent of people at risk of having one.

He added that the new technology will make such predictions easier because it works together with existing CT technology. The research was based on two large, independent studies of 4,000 patients in Germany, and the US. A company with ties to Oxford University is developing a service to examine CT scans of patients around the world, Reuters reported.

The musician Moby once said, “Music has no form whatsoever--all it is is air moving just a little bit differently. It’s the only artform that you can’t touch.” It is true that we cannot touch music, but that does not mean that music is invisible. There is, in fact, away to “see” music.

How can we see music? Neuroscientists (神经科学家) use MRI machines to look inside the brain. These tools let them see the neurons, or braincells, which are in use when people are listening to music. Computer screens linked to MRIs show that when people listen to music, neurons light up in many parts of the brain.

Neuroscientists have ds covered that it isn’t necessary to hear music for the neurons to light up. Even when you just think about a song, these neurons light up. In addition, the same neural activity in the same part of the brain happens when people experience other pleasurable activities. For example, some of the same neurons light up when we eat something delicious or hug a love done. Negative feelings such as fear or anxiety make neurons in a different area light up. However, when an anxious or frightened person listens to pleasurable music, these neurons stop lighting up.

Why does music have so many benefits? The answer maybe because it uses so many different parts of the brain. According to neuroscientists, using many parts of the brain at one time gives your brain a good “workout.” Reading music while playing a musical instrument uses more parts of the brain simultaneously (同时地) than most other activities. It involves both physical movement and mental activity, much like playing a sport such as soccer.

So, although Moby is completely correct that we cannot touch music, it is possible to “see” music. There is still a lot to learn about the effects of music on our brain. However, there is no doubt that scientists have shown that music is an extremely powerful artform with many positive effects.