From Dr. Tom Woodward: Many of us have had to undergo quarantine recently, including myself, as I returned early from Serbia in March. Did you know that “quarantine” is a dramatic picture that C. S. Lewis used in his first two science fiction novels? In “Perelandra” and “Out of the Silent Planet,”  Lewis pictured Earth as the planet that had to be divinely quarantined, lest the infection of sin,…