Apollo 13 was launched at Kennedy Space Center on April 11, 1970. The mission report devotes a considerable amount -- over 7 pages -- to a set of electrical measurements at the launch site:
The separate experiments consisted of measurements of the atmospheric electric field, low-frequency and very-low-frequency radio noise, the air/earth current density, and the electrical current flowing in the earth's surface
No mission before or since has studied electrical phenomena at the launch site to such detail. Why was so much data collected with Apollo 13 for this purpose?
I am hoping that some steely-eyed missile man can provide an answer.
This is the first of a series of questions honoring the 50th anniversary of Apollo 13, "NASA's finest hour".