Scientists are a bit like bird watchers. They set up their experiment and then watch quietly from their hide to see what nature reveals to them, taking no part in the action. Thousands of years' worth of science are built on this approach.
Modern theories, however, tell a different story. Quantum mechanics suggests that the very act of observation can change what is being observed. The very vastness of the cosmos means we need to understand our place in it before we can draw conclusions about it. How can this be? This series of articles and videos explores some basic questions about the role of the observers in physics.
This package is part of our Who's watching? The physics of observers project, run in collaboration with FQXi. Click here to see more articles and videos about questions to do with observers in physics.