United Kingdom suggested that speaking a second language could increase an average worker's salary by £3000 (€3 300) a year, or £145 000 (€159 000) in a lifetime. Further results showed that nine out of 10 British companies thought their businesses could benefit from better language skills. Studies show that a bilingual or multilingual person can earn much more than a computer programmer or engineer because they can use their abilities in foreign language to obtain success in a wide range of career paths. In addition, due to the increase in the number of people from different parts of the world, a multilingual person can more easily communicate with prospective customers. Also in 2004, a study by University College London (UCL) examined the brains of 105 people who could speak more than one language. The study found that people who learned a second language when younger had denser grey matter than those who learned one later. Grey matter is an area of the brain where information is most efficiently processed, due to the function of specific nerve cells. A series of experiments on more than 300 people from the U.S. and Korea found that thinking in a second language reduced deep-seated, misleading biases that unduly influence how risks and benefits are perceived. Other research has shown that early exposure to a second language increases divergent thinking strategies, helping not only in language-related tasks, but also in areas such as math. Children early on have different ways of expressing themselves, such that they better understand there is more than one way to look at a problem and that there is more than one solution. Foreign language versus second language Although significant differences between the definitions of second language and foreign language may be hard to find as the two terms are often taken as synonyms, research has been carried out to shed light on the differentiating traits of the two. The distinction between acronyms TESL (Teaching of English as a Second Language) and TEFL (Teaching of English as a Foreign Language) shows the attention different researchers have paid to the concepts of foreign language and second language. Richards and Schmidt (2002: 472) provide the following information about second language: "In a broad sense, any language learned after one has learnt one's native language [is called second language]. However, when contrasted with foreign language, the term refers more narrowly to a language