In what way is »care« a matter of »tinkering«? Rather than presenting care as a (preferably »warm«) relation between human beings, the various contributions to the volume give the material world (usually cast as »cold«) a prominent place in their analysis. Thus, this book does not continue to oppose care and technology, but contributes to rethinking both in such a way that they can be analysed together. Technology is not cast as a functional tool, easy to control - it is shifting, changing, surprising and adaptable. In care practices all »things« are (and have to be) tinkered with persistently. Knowledge is fluid, too. Rather than a