Daily Polar Sea Ice: Two Year Planetary History | NASA Earth Observatory FriendsofNASA.org: This visualization shows the daily Arctic and Antarctic sea ice and seasonal land cover change over a two-year history from the present with a single frame rendered for each day. The Japan Aerospace Exploration Agency (JAXA) provides many water-related products derived from data acquired by the Advanced Microwave Scanning Radiometer 2 (AMSR2) instrument aboard the Global Change Observation Mission 1st-Wat

Radiometers: three “light mills” from my growing collection of radiometers (now at 28 so far), including a double with two spinning flys in the same partial vacuum volume. Here the initial light is from a LED, and then a halogen incandescent bulb is turned on which activates the motion. This device goes way back, invented in 1873 by the famous chemist Sir William Crookes when he was investigating partial vacuum environments. Light heats up the “vanes” which then heat up the very thin gas left in