&gt; The interference patterns can be washed out by decoherence: They vanish as the researchers admit gas into the apparatus, increasing the interactions of the molecules with their environment.<p>I know that this has been know for a long time, but it is nice to see a clear experiment that shows that decoherence has nothing to do with &#x27;measurement&#x27; or &#x27;looking&#x27; like most stories about quantum phenomenon try to imply. Nice to see this particular abuse of the anthropic principle laid to rest.