Could Technology Make Animal Testing Obsolete?

Millions of animals are used in research every year. Cosmetics, pesticides, pharmaceuticals: Half of every dollar we spend on products is for something that was tested on animals. Animal-rights advocates condemn animal testing, but many scientists say it is vital. Can technology solve this problem?  Dr. Thomas Hartung, director of the Johns Hopkins University Center for Alternatives to Animal Testing, believes it can go a long way. His own lab at the Bloomberg School of Public Health has just developed a tiny replica of the brain using human skin cells. This mini-brain could replace hundreds of thousands of animals now used in neurology labs.