Although Dr Duif discounts each of the conventional explanations on its own, he admits that they might, in combination, account for the Allais effect.

ECONOMIST: Gravitational anomalies

Dr Duif has examined various conventional explanations for the Allais effect.

ECONOMIST: Gravitational anomalies

Dr Duif rules out a third explanation, too: that cooling of the Earth's crust due to the eclipse shadow causes the ground to tilt slightly, and thus distorts the results.

ECONOMIST: Gravitational anomalies