There was a need to use science and technology as a tool for social transformation, Minister of State for Science and Technology Jitendra Singh said here Tuesday.Singh, who visited the National Physical Laboratory, a constituent laboratory of the Council of Scientific and Industrial Research (CSIR) here, asked the media to propagate this message widely, particularly to the youth of the country so that they take up science and technology as a career.He also emphasised that children should be encouraged to visit national laboratories like the NPL, which have made seminal contributions to the growth of science and technology in the country.The minister interacted with young scientists of the NPL after listening to a scientific presentation on the current research and development activities.