In the documentary "Stephen Hawking's universe", the British physicist categorically denied that man can travel into the past.
But what is feasible physically impossible in a virtual world, thanks to a series of Internet resources that allow us to look at the world that our grandparents lived.
Recently added to the list click Pastmapper, a kind of Google maps through which we can see were the streets of San Francisco, USA, 1853.
Although still in its infancy, as the current page is a trial version, the driver is considered the germ of a global network to reconstruct the past of cities around the world.
Google Campus
"I live in San Francisco and I enjoy telling people that visits the city's history and how it has changed. So I started doing a little research online," said Bradley Thompson, a graphic designer and creator of Pastmapper.
The implementation of this project came during a conference on the humanities in the digital world
hosted by Google Campus in Silicon Valley and aimed at people interested in maps and history.
When Thompson explained his idea for a Google maps of the past, to include details of streets and businesses, it generated much interest. Shortly after he had the help of a Google developer.
For several months, Thompson investigated old maps of the city with the help of volunteer historians, creating the first sketch that aspires to be a kind of Wikipedia of the past.
"A kind of Wikipedia"
The system was developed from the Illustrator program and the technology of Google maps API and the idea is that, like the online encyclopedia, reaches the point where users can add data.
"It has great potential for people who can explain where they lived," he said, "over the maps may be added as data layers.
For now, the map allows us to locate streets of San Francisco that no longer exist, or where lived Miss Bowden, designer dresses, and George Gordon, a local blacksmith and where is the room or where they were the salted or shops selling coal.
But in the future, Thompson expected to include further information service, covering more cities and dates.
Augmented Reality
Pastmapping not the first Internet resource that aims to become a time machine.
In 2010 was launched in the UK click Historypin page, which also works in collaboration with Googlemapsclic, as well as museums and libraries.
The site started with the City of London and has already spread to cities around the world.
The difference with this is that beyond showing streets and businesses, this virtual map includes photographs, video, audio and personal stories hung by users with dates between 1840 and today.
Recently, it launched an application for android and iphone that uses augmented reality technology to allow users to access this information by simply pointing the phone to a particular street.
The place is quite a nostalgic fetish, and includes material posted by users all around Latin America, from suspension bridges in Paraguay in 1926 the state of the streets the Colombian city of Bucaramanga in 1920.
