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Satellite Pictures Show Growth of Cities Worldwide

CNN and NASA's Landsat department have released a series of amazing satellite pictures showing the dramatic growth of urban areas around the world in the past 30 years. The two superimposed images above show Las Vegas in 1984 and 2011. Click and drag the green cursor on the image to see the changes before and after. See how what used to be barren desert is now lush suburban lawns. Also note how Lake Mead has dramatically shrunk in the same period of time... Las Vegas grew from 520,000 people in 1986 to 1.9 million in 2011. 

NASA releases new details on next SLS rockets

NASA is fine-tuning its design for the new Space Launch System (SLS) that will send astronauts to the moon, asteroids and possibly Mars. Basically there will be three main types of rocket, the Block 1, Block 1A and Block 2. Block 1A and Block 2 will both have a crewed and a cargo variant, so that's a total of 5 models. The most important difference with what was announced last September is that the main core stage will now have four or five RS-25D/E Space Shuttle Main Engines (SSME) instead of three.

Black Rock City 2015

'Biohazard' city plan

With all the mess surrounding the ticket sales for this year's Burning Man (for those who don't know, demand largely outstripped supply, and the event sold out its 57,000 tickets, leaving tens of thousands of burners without tickets), I started working on ideas about how to enlarge Black Rock City to accommodate more people. The Burning Man Organization (BORG) is trying to get the Bureau of Land Management (BLM, the federal agency that regulates the public land where Burning Man takes place) to allow them to slowly increase the population from its current cap of 55,000 people to 70,000 in 2016. 

Cité de l'Espace

Ariane 5 rocket

During my last visit to France, I visited the Cité de l'Espace in Toulouse, space capital of Europe. The Cité de l'Espace (City of Space) is the european equivalent of the Kenedy Space Center's visitor complex. In addition to numerous interactive exhibits revolving around space exploration, they have a bunch of real space hardware on display, including a Soyuz spaceship and a mockup of the Russian Mir space station that was once used to train astronauts.

Ohm Sport XS750 Electric Bike Test Ride

Back in November I had the opportunity to try a Ohm Sport XS750 electric bicycle for a day, so I though I'd post a review about it. The day long test ride was graciously offered to me by The New Wheel, a cool electric bike retailer in North Beach. So on a sunny Sunday morning, I embarked upon a 30 mile long ride around San Francisco.

Cesar Chavez Boulevard Improvements

For those wondering what that mess is all about on Cesar Chavez Boulevard in San Francisco, here is the lowdown: They are in the process of replacing a giant 8 feet diameter sewer pipe that runs under the whole length of Cesar Chavez Blvd, from Guerrero Street to the 101 freeway, and also under Valencia Street between Chavez and Mission St (where the Burger King is) as well as under several adjacent streets. So what we see right now around Harrison Street is just the beginning! Once they are done with the underground work, Cesar Chavez blvd will be redesigned, with an addition of bike lanes and a median, plus trees on both sides.