Organic apples can be cheaper, tastier and better for the environment.
Our planet is sick. New alphabet for signers A better bridge from sign language to written English might help deaf children learning to read. In the volatile 'first past the post' voting systems used by Britain and the US, opinion polls leave a lot to be desired. 9 DEC 1999 Patent on key PCR enzyme ruled invalid One of the key tools of biological research, 'Taq DNA polymerase' is at the centre of a fierce legal battle. David Dickson reports on the latest development.