Adri turns to you. Her brow is furrowed. "Now this place we're in, this used to be a missile silo," she begins.

"Right," you say.

"So like there used to be a missile here," she goes on.

"That's right."

"A nuclear missile? So maybe the walls are radioactive? And maybe this radiation is what's stopping the photosynthesis in the plants. That's my theory - the radioactivity has something to do with it."

CONTINUE>