The Oracle says: Michio Kaku has a Kevin Bacon number of 3.
Michio Kaku was in "2057" (2007) {The World (#1.3)} with Tim Williams (I)
Tim Williams (I) was in Beyond the Sea (2004) with John Goodman (I)
John Goodman (I) was in Death Sentence (2007) with Kevin Bacon
Wow, thought I had it beat that time.
Don't try SpongeBob, he's not a real person.