PositiveThe GuardianThis is a necessary and important book. To know that one fifth of people do not have a choice about how they physically react to stress should make us more understanding of the differences between us all. Children should be nurtured so that both orchids and dandelions can thrive. But I worry about how the orchid and dandelion theory might be employed. The danger of putting people into categories is that we unwittingly respond not to the person, but to their label.