Have You Got a 27B-6? - Weekly Trivia!

This week saw 3 different answers to the trivia question, but Brazil was the one that featured Robert De Niro in a supporting role. He played rogue freelance Heating Engineer Harry Tuttle, a terrorist of the needlessly complex and overbearing bureaucratic state. My dad is on a roll now with a 2-week winning streak!

Oh boy, but now we're back to physics trivia. Things are starting to get interesting as physicists hypothesize what exists at distances so microscopic that they can't be probed by current instruments. My question:

Which physicist (according to Greene), in an effort to unify the fundamental forces, hypothesized a spatial dimension in addition to the three (four, including time) perceivable by us?

• Albert Einstein
• Wolfgang Pauli
• Theodor Kaluza
• James Maxwell
• Erwin Schrödinger

Good luck, and have a great week.