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.
Web wide crawl with initial seedlist and crawler configuration from October 2010
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110106214548/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/halftone
A Halftone is an image that is comprised of a number of small dots, instead of a continuous tone. The dots used can be different shapes, sizes and colours and they are normally larger to show darker colours and smaller to show lighter colours.