Who said "Science explains things, but it can't explain why."?

This quote is attributed to Kenny McCormick.

Science explains things, but it can't explain why. - Kenny McCormick

"Science explains things, but it can't explain why."

Kenny McCormick Science

"Mmph mmph mrmph!"

"I'm not fat, I'm just big boned"

"Dude, we're in third grade"

"This is so cool"

"Science helps us understand the world."

"I've witnessed the birth of science, and it continues to amaze me."

"I'm something of a scientist myself."

"The fusion process is self-sustaining now!"