I believe the stock is acting logically, when there is news of advances, potential deals etc. the stock gains as is expected and retaines part of the gain. When the SP retains some of the gains on no news or little news IMO thats a normal reaction. If we see great news and the SP drops IMO there is some poison hidden in the company or manipulation by others. From what I see in this stock it reacts typically and responds to good news. I have noted that when the PSC pushes something it channels money to the selected stock its advocating and it gets all the new excitement, ZENG is the latest and has been rising nicely. All this is just my opinion.
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