David Rumsey Map Center | Stanford Libraries David Rumsey Map Collection | Cartography Associates:

Stellarium Astronomy Software: Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is

Celestia - real-time 3D visualization of space: Gallery: Wikipedia:

This wallchart is unique in that it serves as both a timeline of evolution and a guide to biological classification. This video describes -- in a step-by-step fashion -- the evolutionary journey from the

Satellites have been watching us for 40 years. Here's what images taken from space reveal about human activities and our global footprint.

On July 20, 2015, NASA released to the world the first image of the sunlit side of Earth captured by the space agency's EPIC camera on NOAA's DSCOVR satellite. DSCOVR: Deep Space Climate Observatory This

Here is a minor edit to the excellent video by Stephane Guisard and Jose Francisco Salgado, posted at Nicolas Bustos channel. Visit for more about the European Southern Observatory. Credits for original

A new kind of Earth Observation Videos

List of sites with Two Factor Auth support which includes SMS, email, phone calls, hardware, and software

P2P communications protocol Mobile App

e-book management

personal research assistant

secure communication

Peer to Peer Search Engine: YaCy Tutorials – YouTube: Wikipedia:

Cryptonote: Wikpedia: Cryptocurrencies: AEON: Bytecoin: Dashcoin: DigitalNote: Monero: Mining: Minergate: Webminer: