Like all AI devices that use National Language Processing or NLP, Alexa does not understand all voices easily. But she learns to understand her people over time. She does, however, require people to speak in simple terms, with appropriate pauses, and use specific word orders. There are many times when she will say "I'm sorry, I don't know the answer to that question." More than likely, she doesn't recognize a word order or misunderstood the question.
As of this writing, Amazon has thousands of sources for flash briefings.  The sources they include can be hyper-local like your local news station. Amazon also has specific topics like tech or business, or general info.  Many of these sources, like NPR, are podcasts provided by Tune-In.  These briefings are audio files Alexa plays for you.  Other sources like the AP news stories are read in Alexa’s voice.  I wish Amazon told you which ones were audio files because her voice drones on after a while.  I hope I get to change her voice like I can with Siri.  Right now, you can just change the language to the English (UK) or German.
Alexa Skills can give users access to accounts they've already set-up, such as the Alexa Skill for SiriusXM radio, ESPN, or even their car insurance if they have Alliance Insurance. With Alexa connected to these accounts, people can pull up details and content through their Alexa-enabled device. For example, the Alexa Skill for Major League Baseball lets Alexa users stay current with baseball stats and hear shows. Use the Alexa Skill for Fandango to not just find a movie but buy a ticket.
The next step in our Alexa flash briefing tutorial is to set up an Alexa skill for delivering the briefing. First, visit the Amazon Developer Console to create a new skill. Begin by giving it a name, then click “next.” You’ll be offered a selection of Alexa skill models to choose from. Select “flash briefing” from the list, then you’ll be met with a series of Alexa flash briefing options.
Amazon's Alexa is the voice-activated, interactive AI bot, or personal assistant, that lets people speak with their Amazon Echo, Echo Dot and other Amazon smart home devices. Like Siri and Cortana, Alexa is designed to respond to a number of different commands and even converse with users. Alexa comes with more than a few capabilities: playing music, pulling up the weather or even reading news. But Alexa Skills are apps that give Alexa even more abilities, letting her speak to more devices even websites.
When Alexa recognizes your voice, stories and news items you’ve already heard will be skipped. To set up voice recognition, say “Alexa, learn my voice.” This is feature is especially useful if you listen to flash briefings on weekends when many flash briefings don’t post new content. With Alexa voice recognition enabled, you won’t hear the flash briefing episodes you already listened to.

Once you’ve filled out the page, it’s time to make a listing or profile page for your flash briefing. This process is the same as with any Alexa skill: give your briefing a short description, a long one and a profile image to use. After that, submit your skill and begin recording your content! When you upload new content to your audio host, it will automatically push to your flash briefing via RSS.
You can create a flash briefing skill if you own, or have the right to distribute, original text or audio content that updates frequently. You should understand web technologies and have the ability to configure HTTPS, RSS and/or JSON content. The voice interactions for a flash briefing skill are defined by Amazon, but you must be able edit the format of your content so that the flash briefing Skill API can understand it.

Note: Your Flash Briefing settings apply to all Alexa devices registered to your Amazon account, and all users in your home get access to the same Flash Briefing content. However, if you or anyone in your home has a voice profile, Flash Briefing automatically skips stories and news items you've already heard. To learn more, go to About Alexa Voice Profiles.
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