If you're hearing impaired, then US alert systems - which use radio signals to broadcast warnings of impending emergencies - are useless. To address that, America's National Public Radio (NPR) has developed a prototype system which shows text alerts on a standalone battery-powered device. via Pocket http://www.bbc.co.uk/news/technology-25632760#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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