Anyone who has driven west lately on a sunny afternoon in the United States knows the blinding effect of a sun that is low in the sky. Just weeks after it fell to its lowest arc of the year (solstice), this is still the time when the sun is both weak and strong. Strong in that it has amazing power to warm my January mood. Weak in that the angled rays deliver less-concentrated heat. Such obliquity was no match for the ice that had formed in the dark of night.