- Jacques Descloitres, MODIS Land Rapid Response Team, NASA/GSFC
- Although the landscapes of Alaska (right) and Russia (left) were covered in snow, the sea ice in the Bering Strait between them appears to be breaking up and receding slightly in this MODIS image from April 22, 2002. The coastal waters of southwestern Alaska are showing dark swirls that could be a mixture of sediment and phytoplankton.
- Metal Ages (Wikipedia)
The Metal Ages is a term for the period of human civilization beginning around 6,000 years ago in which metallurgy rapidly advanced and human populations started using metals such as copper, tin, bronze and finally iron, to make tools and weapons. By heating and shaping metals in hot furnaces, people also learned to use precious metals such as gold and silver to make intricate jewellery.
