QN Postings

My daughter Maria just sent this picture she had taken in Alaska from the day after her AAPT presentation (which went very well, thank you). She had gone cross-country, uh, cross-tundra skiing with NSF Operative Maria Niland and Jefferson Lab Guru Steve Gagnon. The photo reminded me of all the nifty phenomena we saw in Alaska: vertical refraction of light from mercury-vapor lamps, snowflake crystals that perfectly reflected the color of the light that hit them, and rainbows on the horizon in daytime. Ice crystals in the air do the neatest things.
-- Ken