Susan Aldridge gives an accessible guide to the world of DNA and also explores the applications of genetic engineering in biotechnology. She takes the reader, step by step, through the fascinating study of molecular biology. Aldridge also looks at the wider world of biotechnology and how genetic engineering can be applied to such problems as producing vegetarian cheese or cleaning up the environment. Although easy to read, this book does not avoid the science and provides a stimulating introduction to this enigmatic part of nature.