Postings I’ve ‘liked’ on reddit.com

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Supersonic Retro Propulsion for Trips to Mars

Apparently, the decision has been made at NASA that supersonic heavy load parachutes just won’t work.  So instead, a rocket to Mars will enter the Mars atmosphere at supersonic speeds using the shockwave from a blasting “retro” rocket to plow through the air instead of the old fashioned heat shield  (“retro” here meaning opposite the direction of travel, not old fashioned)

Given this decision it’s interesting that SpaceX’s last booster reentry intentionally started it’s reentry burn high to simulate supersonic reentry burn conditions in the Mars atmosphere.    And NASA mobilized special thermal cameras to record this experiment (that otherwise would’ve cost NASA hundreds of millions to test/simulate)

http://www.nasa.gov/press/2014/october/new-commercial-rocket-descent-data-may-help-nasa-with-future-mars-landings/index.html#.VEGN4BbdeI0

Also see:

Development of Supersonic Retro-Propulsion for Future Mars Entry, Descent, and Landing Systems (PDF)

SupersonicRetroPropulsionAnd a video at:

Supersonic Retropropulsion (wind tunnel) Test, Mach 4.6 Schlieren Video (youtube)

I like saying “Supersonic Retro-Propulsion”

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A great photo of the Spacex Falcon CRS-8 launch

Spacex Falcon CRS-8 launch

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Beautiful time lapse video of the Albuquerque balloon festival

I want to go to this someday.

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The Yale Glee Club singing on the train

And the train “conductor” actually conducts:

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The irony here is delicious

View post on imgur.com

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*This* is the way voice the dragon Smaug

From the movie The Hobbit: The Desolation of Smaug :

 

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How synchronized hammer strikes could generate nuclear fusion

This TED talk actually sounds sort of reasonable.   Ie., not cold fusion.  I like the sound name of the company: “General Fusion”.

 

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Why is my WiFi slow? (because of a total lack of planning?)

The article Why is my WiFi slow? Why does my WiFi keep dropping out? addresses the technical issues of why WiFi sucks, but just treats the situation as given from G-d.  It’s not.   This is what happens when the mantra of “all government is bad” gets applied to the FCC.  They do nothing and let an essential service develop in a way that’s not reliable.

And, by the way, because the article only covers current problems, it doesn’t talk about one of the bigger technical fiasco’s of the 20th/21st century, the woefully inadequate WEP encryption that was the WiFi standard for more than 10 years.

Posted in politics, Technology | Comments Off on Why is my WiFi slow? (because of a total lack of planning?)

Beautiful panning timelapse videos of LA

This reminds me of Bladerunner, Baraka, and Koyyanisqatsi.   Both beautiful and haunting:

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Chocolate consumption and number of Nobel laureates

From the New England Journal of Medicine:

Also see hilarious spurious data correlations by Tyler Vigen such as the correlation between:

“US spending on science, space, and technology” and “Suicides by hanging, strangulation and suffocation”

 

 

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