Wednesday, June 28, 2017

Space Shuttle Challenger STS-51L Accident

Astronauts Likely Survived Challenger Explosion
https://www.youtube.com/watch?v=uqcd_3daPQ8







Inside Space Shuttle Challenger STS-51L During The Accident (Higher Quality)
https://www.youtube.com/watch?v=4y37aRSn7Uw



2:48 ice 7:17 puff of smoke at o-ring failure 11:50 leakage plume visible from ground camera 12:19 SRB pressure drops because of leak, external tank pressure drops, navigation system starts to compensate for anomaly 13:54 SRB strut fails and pulled loose 14:19 cloud now is circumference indicating lower tank failure 14:30 middle tank shows leak 14:50 oxygen streams out of upper tank 14:56 flash between orbiter and external tank 15:10 just before total breakup 15:18 fireball envelops vehicle hiding breakup 16:35 shuttle nose area emerges from fireball 16:38 orange puff from nose reaction thrusters blowing up 17:07 nose separates from crew cabin 17:44 crew cabin 18:07 left wing, crew cabin just above contrail 18:20 crew cabin 22:26 about half of shuttle structure recovered 22:35 forward lower structure under crew cabin 22:42 heat damage to right side of shuttle 22:55 right side of rudder speed brake scorched but not left side 23:07 right elevon heat scorch damage 23:19 aft left body shows no heat damage 23:31 no evidence of fire or explosion from within vehicle. Damage caused by SRB flame and aerodynamic forces 24:16 tank nose cap no damage 24:33 some foam insulation charred, others no effect. 24:48 tank explosive charges still intact 25:06 shearing of attachment fitting 26:37 shows the hole in the booster around the o-ring failure


Published on Jan 5, 2017
On January 28, 1986 despite the warnings of engineers not to launch in freezing temperatures, NASA management chose to launch Space Shuttle Challenger. The result was the loss of 7 astronauts in a horrific explosion 73 seconds later when flames from a solid rocket booster leak from a cracked o-ring and burned through the main fuel tank. The solid rocket boosters remained intact after the explosion and continued on out of control before mission control sent a self destruct signal to them so they could not cause destruction on the ground.

This video gives a detailed and technical explanation of the entire Challenger accident including pre-launch assembly, launch, post-launch, and accident investigation. It is highly recommended that the entire video be viewed to get a full understanding of the Space Shuttle Challenger accident.

Also check out these other Space Shuttle Challenger videos...


Space Shuttle Challenger STS-51L Launch & Explosion Complete Footage
https://youtu.be/7ilFdTMKooY

Never Seen Before! Shocking Video of Space Shuttle Challenger STS-51L Debris!
https://youtu.be/ST5ks0B2Gwc

Space Shuttle Challenger STS-51L Launch And Explosion
https://youtu.be/EssKzOj-kME

NASA Honors The Crew Of Space Shuttle Challenger STS-51L
https://youtu.be/BHPdxDEOyrI


For more Space Shuttle Columbia accident video watch the following...


Inside Space Shuttle Columbia STS-107 During The Accident -- COMPLETE VIDEO
https://youtu.be/jen619TfDJU

Never Heard Before! Shocking Final Words Of Space Shuttle Columbia STS-107!
https://youtu.be/Tr1UzVGgBGA

Space Shuttle Columbia STS-1 Launch
https://youtu.be/UgumPYJcL1U

Inside Space Shuttle Columbia STS-107 During The Accident
https://youtu.be/rvG8A4g0gEY

Sixteen Minutes From Home -- Tribute To Space Shuttle Columbia STS-107
https://youtu.be/JpefH4rdWnE

So Close To Home: Tribute To Space Shuttle Columbia STS-107
https://youtu.be/JgmVDWpO9TA

Sunday, April 23, 2017

How America Turned Against Smart Kids

links to my website, I don't necessarily agree with everything here but brings up good points of when equity means helping top 1% kids. 

(To put these numbers in perspective, the average IQ of a white or Asian student at MIT, by one estimate, is 138.) 


How America Turned Against Smart Kids

Parents of gifted children face egalitarian dogmas and an anti-intellectual culture.

Friday, January 20, 2017

St Paul Minnesota School Test Scores - Asians Lag Whites

St Paul Minnesota School Test Scores

Asians scores somewhat lower than whites in Minnesota statewide but in St Paul score much lower than whites in math, and as low as Hispanic in reading. It does not prove that high Asian achievement is a myth as much as Asians do lag in some parts of America.


Model Minority? In St. Paul, Asian-American Test Scores Lag
www.nbcnews.com/news/asian-america/model-minority-st-paul-asian...

Public school officials in St. Paul, Minnesota are learning first hand that the "Model Minority" image of Asian Americans indeed is a myth. According to school ...

Model Minority? In St. Paul, Asian-American Test Scores ...
www.ewa.org/.../model-minority-st-paul-asian-american-test-scores-lag

Public school officials in St. Paul, Minnesota are learning first hand that the “Model Minority” image of Asian Americans indeed is a myth.

Model Minority? In St. Paul, Asian-American Test Scores Lag

Public school officials in St. Paul, Minnesota are learning first hand that the “Model Minority” image of Asian Americans indeed is a myth.
According to school records, Asian Americans, the largest racial group in the St. Paul schools have impeccable attendance records and the fewest suspensions. But in the important benchmark of standardized testing, those same students are falling far short compared to the district average.
City data showed Asian American kids are less proficient in math — 38 percent pass the Minnesota Comprehensive Assessments (MCAs) vs. 59 percent of Asian American kids statewide, and similarly lag in reading — 29 percent pass MCAs vs. 51 percent of Asian Americans statewide.

Achievement gap persists in statewide MCA test scores ...
www.mprnews.org/story/2014/08/26/achievement-gap-persists-in...
Achievement gap persists in statewide MCA test scores; slight improvement overall. ... In St. Paul, iPads for all.


Mathematics MCA-III Grades 3-8
      AmInd  AsianPI  Hisp  Black  White   
2013  37     61       39    35     70
2014  38     62       40    35     71
Grade 11
2014   24    48       25    20     57
White pass at twice the rate of whites
Asians are close, but lag whites statewide
They lag much worse in urban St. Paul
scrib p. 19
Grade 11



Minnesota student performance on proficiency tests holds ...
www.twincities.com/2014/08/25/minnesota-student-performance-on...

Minnesota student performance on proficiency tests holds steady, with some modest gains

Asian/Pacific Islander students alternatively, lagged between 9 and 16 percentage points behind, slightly narrowing the gap between their white peers.
Black students remain the furthest behind and saw the least change over last year’s scores, though the group’s reading scores improved from 32 to 33 percent proficient.


rough pass rates from charts:
St Paul public school asians score much worse than statewide, and much worse than whites. In most districts in west coast, Asians scores only slightly worse in urban districts and better in suburbs compared to whites.
Math Grade 3-8 10 and 11
      AmInd  AsianPI  Hisp  Black  White
2014  32     62       29    25     70
Reading - Asians score as low as Hispanic
2014  35     30       30    25     73