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    Little science behind 'pollen vortex' prediction

    Headlines warn of yet another bad allergy season stemming from this winter's polar vortex, but these dire annual predictions may be based more on guesswork than science. Count the pollen to know for sure. (April 25)
    Video provided by AP 
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    Information
    Source name: 
    The Associated Press
    Unique identifier: CP13419858 
    Legacy Identifier: 6408f382edd343edad02b9b382d60fc9 
    Type: Video 
    Duration: 1m59s 
    Dimensions: 856px × 480px     26.36 MB 
    Usage rights: Digital platform use only. Broadcast rights and editing of content prohibited. 
    Create Date: 4/25/2014 8:41:20 AM 
    Display aspect ratio: 107:60