DDD is no longer registered for agricultural use in the United States, but the general population continues to be exposed to it due to its long persistence time.
2.
That no pure persistence time is an ESS can be demonstrated simply by considering a putative ESS bid of " x ", which will be beaten by a bid of " x + \ delta ".
3.
The IBM 740 Cathode Ray Tube Output Recorder was also available, which was a 21-inch vector display with a very long phosphor persistence time of 20 seconds for human viewing, together with a 7-inch display receiving the same signal as the larger display but with a fast-decaying phosphor brightness designed to be photographed with an attached camera.
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