Since the introduction of mobile phones,concerns have been raised about the potential health impacts from cellular phone use.Studies from the National Cancer Institute and researchers at the Danish Institute of Cancer Epidemiology in Copenhagen do not show any link between cellular phone use and cancer.The Danish study only covered analog mobile phone usage up through 1995,and subjects who started mobile phone usage after 1995 were counted as non-users in the study.[16] However,a study by the International Agency for Research on Cancer of 4,500 users found a statistically significant link between tumor frequency and mobile phone use
Cheating in the exam is a serious problem.We can`t test ourselves carefully if we cheat.It can hurt teacher,too.
