This week, scientists claimed that chimps are so close to mankind that they should be reclassified as practically human. So should they have the same rights as us? Tim Radford reports on a debate that could help save them from extinction, while Stephen Moss visits them in 'person' at London Zoo Chimps have language. They can, and do, communicate with humans. There is a linguist chimp called Nim Chimpsky with a vocabulary of 125 signs, all used correctly. Chimps can solve problems, use tools and when they lose their teeth, even improvise a makeshift food blender. Two observers have now...