Smoking leaves an "archaeological record" of the hundreds of DNA mutations it causes, scientists have discovered. Having sequenced thousands of tumour genomes, they found a 20-a-day smoker would rack up an average of 150 mutations in every lung cell each year. The changes are permanent, and persist even if someone gives up smoking. Researchers say analysing tumour DNA may help explain the underlyi
At 87, Noam Chomsky, the founder of modern linguistics, remains a vital presence in American intellectual life. An emeritus professor at the Massachusetts Institute of Technology, where he still teaches, he has a dual identity, reflected in his several dozen books. Many are on theoretical linguistics and the philosophy of mind. Others are sharp, leftish polemics on American politics. Dr. Chomsky i
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