Since 1990, hand-held mobile phones have been used as communication devices. Mobile phones have gone through a lot of design changes over the years. Do online research and discuss the major changes in mobile phone designs in the last 20 years.

IMPACT: Access to the mobile web was a major improvement for cell phones in the 1990s. With 2G (digital cellular networks), came the ability to access media content and the World Wide Web on cell phones.

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constructing a building's framework requires a solid foundation

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science is the study of the nature and behavior of natural things and the knowledge that we obtain about them. a science is a particular branch of science such as physics, chemistry, or biology. physics is the best example of a science which has developed strong, abstract theories.

pseudoscience is a collection of beliefs or practices mistakenly regarded as being based on scientific method.

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