HITACHI-OTA, Aug 6 — Glinting in the night, halfway up a hill in Japan, the greenhouse-like “Ku-An” test lab is lit by electricity harnessed from 1,500 wooden boxes of soil...

Glinting in the night, halfway up a hill in Japan, the greenhouse-like "Ku-An" test lab is lit by electricity harnessed from 1,500 wooden boxes of soil and compost.

HITACHI-OTA, Aug 6 — Glinting in the night, halfway up a hill in Japan, the greenhouse-like “Ku-An” test lab is lit by electricity harnessed from 1,500 wooden boxes of soil...