Why is Homer Simpson yellow?

Answer 1

On the first episode, it had this HALARIOUS (:) scene where they were evacuating to caves and underground shelters because the sun was going to have a huge blast, or as Homer's son called it, "Sun f**t".  So it was really frustrating to the watchers because they were so anxious because the Simpsons kept stopping their car and stuff, like where there was a pebble in the way.  Homer would stop five feet in front of it, study it, assign it a name, then toss it away.  They did not go to the shelters in time, but the stone helped them from dying.  They turned yellow as a result.