"It seems to be the laughter of those crippled kids that did it," Johnson added. "Zeke got an idea there how beneficial laughter is."
Billington nodded. "However, maybe Zeke's analysis is overly-simplified." His mouth set in a serious line. "The laughter of kids is hardly comparable to the laughter of adults. The kids were laughing with Zeke. Does he realize the difference there?"
Johnson said, "Maybe he doesn't. The Martians have a lot to learn about human beings."
"So do we," Billington sighed.