Moe is not a scientist. He's just a dude. One day when a friend asks him "do you believe in evolution?," he understands it as the scientific community relaxing its rules and embracing everyone's opinion as part of the fact-finding process. So feeling guilty for never having studied science, and out of the goodness of his heart, he lists down what he thinks of every major scientific fact out there as a peace offering for scientists everywhere. These are his 'scientific opinions'.