Today, it is research with human embryonic stem cells and attempts to prepare cloned stem cells for research and medical therapies that are being disavowed as being ethically unacceptable.

But I felt it necessary to be part of the war effort and I enlisted in the Navy to be a flyer.

Looking back, I realize that nurturing curiosity and the instinct to seek solutions are perhaps the most important contributions education can make.

But the prospects of designing chemical plants for industrial scale chemical processes seemed far less interesting than the chemical events that occur in biological systems.

Novel technologies and ideas that impinge on human biology and their perceived impact on human values have renewed strains in the relationship between science and society.

Moreover, the concern of some that moving DNA among species would breach customary breeding barriers and have profound effects on natural evolutionary processes has substantially disappeared as the science revealed that such exchanges occur in nature.

Paradoxically, no such embargo exists for the drugs and therapies that have revolutionized the treatment of serious diseases although many of them were created with the same technologies.