27 MARCH 1971, page 15

Research

New drugs for old MILES WEATHERALL At least four separate technical problems— chemical, biological, medical and predictive— must be solved before any new drug is made generally......

South America

The new ideological battleground? ALISTAIR HORNE When I left Bogota, my last port of call in South America, the city was in the process of being taken apart by red students.......