The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
This iron and aluminum alloy's unique striated structure was created when the liquid metal was poured into a water-cooled copper mold. The production of this master alloy is the first step in developing advanced materials for new energy technologies, sponsored by Advanced Research Projects Agency - Energy (ARPA-E)