In addition, some of the materials used in IQ tests may be totally foreign to certain cultures, thus creating inequalities and biases. It is interesting to note that IQ scores have increased so much over the 20th century that most of today's test takers would be considered 'geniuses' by 1900 standards.
Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines.
DSL stands for Digital Subscriber Line which provides digital data transmission over the wires of local telephone network. Originally DSL stands for Digital Subscriber Loop, but later on Digital Subscriber Line has been widely adopted as a more marketing-friendly term for ADSL, which is the most popular version of consumer-ready DSL.