Science and technology have helped man to understand the structure of his body and how it works ,as well as what he need to do to keep himself healthy. In medicine, science has helped man in many ways. Medical worker use physical examination, laboratory tests,ultrasound and other modern scientific test to find out accurately the nature of man illnesses. In agricultural, scientific knowledge has helped man to increase food production and improve food preservation. In communication it helps us to communicate by telephone or to send message quickly by radiophone, satellite phone ,mobile phone,video phone fax ,email.
