Due to this high prevalence, vertebral artery hypoplasia (VAH) has not yet been considered an independent risk factor for ischemic stroke [1,2].
How to use your own headphones on Americanâs new 777-300ER. Passengers traveling in First and Business Class on Americanâs new 777-300ER are provided with Bose QuietComfort 15 Acoustic Noise Canceling headphones to use during the flight.
Back in the 1880âs, the first headphones (or at least their early ancestors) were used by telephone operators. It was a single earpiece that rested on the userâs shoulder and weighed over 10 pounds (kinda like placing a boombox on your shoulder).