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A 2015 experiment by Hanson and Delft colleagues provided further confirmation that the quantum world violates the Bell inequalities, being the first Bell test to close two known experimental loopholes simultaneously. The experiment was also taken to provide new evidence of ‘spooky action at a distance’. Here we argue for caution about the latter claim. The Delft experiment relies on entanglement swapping, and our main claim is that this geometry introduces an additional loophole in the argument from violation of the (...) Bell inequalities to action at a distance: the apparent action at a distance may be an artifact of ‘collider bias’. In the absence of retrocausality, the sensitivity of such experiments to this ‘Collider Loophole’ depends on the temporal relation between the entanglement swapping measurement C and the two measurements A and B between which we seek to infer a causal connection. CL looms large if the C is in the future of A and B, but not if C is in the past. The Delft experiment itself is the intermediate case, in which the separation is spacelike. We argue that this leaves it vulnerable to CL, unable to establish conclusively that it avoids it. (shrink)

What’s the deal with the really, really, weird-acting stuff that everything is made of? Can we ever take in our everyday world the same way again if we fully understand the nature of the quantum world? With Jeffrey Bub , Tim Maudlin , and Drew Arrowood.

Should defaming the name of God be of concern even for those who do not have faith in Him? With Gregory Reichberg and Farzad Mahootian.

Should defaming the name of God be of concern even for those who do not have faith in Him? With Gregory Reichberg and Farzad Mahootian.

What is science, and what is it not? Is falsifiability the key to drawing this line? How and why does science work? Should we worry whether science is talking about a "real" world? And should we stop thinking there is a single thing we can call "the scientific method"? With Deborah Mayo, Robert Rynasiewicz, and Drew Arrowood.

Now, in A Year of Iowa Nature, he presents fifty-five of his favorite photos along with an evocative introduction that urges us to go forth and discover the beauty in our own backyards.