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.
Two other types of xDSL technologies are high-data-rate DSL, known as HDSL, and very high data-rate DSL, known as VDSL. DSL technologies generally use sophisticated modulation schemes to pack data onto copper wires.