In late 2016, staff at the US embassy in Havana, Cuba, began to report hearing unusual sounds. Over the coming months, some staff were struck down by hearing loss and concussion-like symptoms. The strange sounds were interpreted as the cause, perhaps even reflecting a sonic weapon of an unknown nature.

The story of the ‘Havana embassy attack’ has been told in detail but, until recently, there were no scientific studies of the event or its aftermath.

That changed on February 15th, w