Dr. Mitchell Valdes-Sosa, General Director of the Cuban Neuroscience Center, speaks during a press conference in Havana, Cuba, on July 23, 2019. - Valdes-Sosa denied the possibility of alleged attacks by Cuban Government from late 2016 using some sort of acoustic weapon on US diplomats posted in Havana and some of their family members who suffered unexplained symptoms ranging from poor balance and vertigo to lack of coordination, unusual eye movements, anxiety and what victims called a "cognitive fog." (Photo by ADALBERTO ROQUE / AFP)