Fossil feathers are usually preserved as carbonaceous films and impressions in lacustrine and marine sediments, or embedded in amber, but rarely mineralized....
Tikal, an ancient Maya city in what is now northern Guatemala, is one of the largest political, economic and military centers of the pre-Columbian Maya...
A research team at Okayama University in Japan has theoretically predicted a new class of ice phases, called aeroices, likely the most stable solid phases...
