Jon Hamilton is a science correspondent for NPR in Washington, DC.
34:11
Military doctors are starting to pay more attention to concussions and other traumatic brain injuries on the battlefield.
| Cookie | Duration | Description |
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| _abck | 1 year | This cookie is used to detect and defend when a client attempt to replay a cookie.This cookie manages the interaction with online bots and takes the appropriate actions. |
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| bcookie | 2 years | LinkedIn sets this cookie from LinkedIn share buttons and ad tags to recognize browser ID. |
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| lidc | 1 day | LinkedIn sets the lidc cookie to facilitate data center selection. |
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| countryCode | session | This cookie is used for storing country code selected from country selector. |
| Cookie | Duration | Description |
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| _fbp | 3 months | This cookie is set by Facebook to display advertisements when either on Facebook or on a digital platform powered by Facebook advertising, after visiting the website. |
| fr | 3 months | Facebook sets this cookie to show relevant advertisements to users by tracking user behaviour across the web, on sites that have Facebook pixel or Facebook social plugin. |
| IDE | 1 year 24 days | Google DoubleClick IDE cookies are used to store information about how the user uses the website to present them with relevant ads and according to the user profile. |
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| personalization_id | 2 years | Twitter sets this cookie to integrate and share features for social media and also store information about how the user uses the website, for tracking and targeting. |
| test_cookie | 15 minutes | The test_cookie is set by doubleclick.net and is used to determine if the user's browser supports cookies. |
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| VISITOR_INFO1_LIVE | 5 months 27 days | A cookie set by YouTube to measure bandwidth that determines whether the user gets the new or old player interface. |
| YSC | session | YSC cookie is set by Youtube and is used to track the views of embedded videos on Youtube pages. |
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| ARRAffinityCU | session | No description available. |
| ccc | 1 month | No description |
| COMPASS | 1 hour | No description |
| cookies.js_dtest | session | No description |
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| f | never | No description available. |
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| li_gc | 2 years | No description |
| loglevel | never | No description available. |
| msToken | 10 days | No description |