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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?


To: James Seagrove who wrote (1014176)5/3/2017 2:52:59 AM
From: Heywood40  Read Replies (1) | Respond to of 1574260
 



To: James Seagrove who wrote (1014176)5/3/2017 2:55:30 AM
From: Heywood401 Recommendation

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rdkflorida2

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Laura Ingraham salutes Trump




To: James Seagrove who wrote (1014176)5/3/2017 9:20:05 AM
From: Wharf Rat  Read Replies (1) | Respond to of 1574260
 
thanks


This illustration depicts one of William Harvey's experiments in his On the Circulation of the Blood (1628). Venal valves had already been discovered, but here Harvey shows that venal blood flows only toward the heart. He ligatured an arm to make obvious the veins and their valves, then pressed blood away from the heart and showed that the vein would remain empty because blocked by the valve.