Keep something out of the newspapers and it can remain a secret forever - even when it is not : the case of wartime DDT

Hard to explain why both the Germans and the Japanese of WWII failed to make use of DDT to reduce their truly immense manpower losses due to endemic insect borne diseases : its use alone, could have prolonged the war a year or two more.

After all, knowledge of how to make the stuff was in the public domain, and in the open scientific literature, having been synthesized more than seventy(70) years earlier.