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General Discussion

15260 threads, 285108 comments (26 Viewing)

What is This Thing?

07/20/2017 by Anonymous Poster
The bell shaped thing is lead. The rest, steel.
Views: 36, Comments: 1
Last comment 07/20/2017 by SolarEagle

Pre Cool the Incoming Air Charge.

07/20/2017 by tonyhemet
I saw the story on the " mistbox " . Not knowing much about it, I thought the engineers here could explain it's value. I have a few questions : A....
Views: 25, Comments: 1
Last comment 07/20/2017 by SolarEagle

Suicidal Robot?

07/19/2017 by BestInShow
Has everyone seen this? I can't stop laughing.
Views: 174, Comments: 9
Last comment 07/20/2017 by JPool

A Reminder to Read the Fine Print

07/19/2017 by BestInShow
Happy Wednesday! I forget which CR4 member signs off the TANSTAAFL; this is a perfect example.
Views: 162, Comments: 21
Last comment 07/20/2017 by Randall
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Commercial Space

1987 threads, 3789 comments (0 Viewing)

AidAnt adjustable chock, the advanced, quickest, easiest and convenient shaft al

07/05/2017 by AidAnt
The AidAnt universal adjustable chock are mounted underneath piston engines, e-motors, pumps, auxiliaries, shaft bearings and many more applications w...
Views: 103, Comments: 0

What Is the Best Digital Store?

07/02/2017 by hitasb
hello , can anyone answer * what is the best digital store? * how can we improve our sale ?
Views: 30, Comments: 0

Recruitment for Engineers in the UK

06/29/2017 by SERlimited
Hi Everyone, This is a quick message to introduce SER Limited to you. We recruit for some of the largest engineering companies in the UK and we are...
Views: 37, Comments: 0

Hiring Software/Hardware Engineers

06/20/2017 by HRBS
ReMute Corp is a startup technology company utilizing mobile apps, firmware, and broadcast television. We are currently hiring software engineers that...
Views: 80, Comments: 0
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CR4 Feedback

690 threads, 12062 comments (0 Viewing)
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Section Blogs

The Engineer's Notebook

424 blog entries, 7004 comments (0 Viewing)

Which Type of Facebook User Are You?

07/15/2017 by M-ReeD
As Facebook becomes an everyday part of our lives (with users spending as much as 30 to 50 minutes a day on the social platform), it is inevitable tha...
Views: 154, Comments: 17
Last comment 07/19/2017 by phoenix911

Smartphone Stupid

07/08/2017 by M-ReeD
Are you in love with your smartphone? When it isn’t with you, do you miss it? When you have a question, do you feel the overwhelming desire to c...
Views: 299, Comments: 17
Last comment 07/15/2017 by dj95401
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Notes & Lines

44 blog entries, 407 comments (0 Viewing)

Black Hole Music and Really Low Notes

07/13/2017 by Hannes
A colleague of mine recently heard from a friend that certain black holes make musical pitches—specifically, scientists have observed a black ho...
Views: 312, Comments: 30
Last comment 07/19/2017 by Rixter

What Did The Past Sound Like?

06/15/2017 by Hannes
Growing up in the early ‘90s, my family still had a big cream-colored rotary phone stuck to our kitchen wall. At the time I didn’t realize...
Views: 448, Comments: 40
Last comment 07/13/2017 by phoenix911
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WoW Blog (Woman of the Week)

192 blog entries, 535 comments (0 Viewing)

Woman of the Week – Alexa Canady

07/17/2017 by lmno24
Alexa Canady is the first woman and African American neurosurgeon in the United States. She grew up in Lansing, Michigan and overcame many obstacles o...
Views: 122, Comments: 0

Woman of the Week – Stephanie Kwolek

07/10/2017 by lmno24
Stephanie Louise Kwolek was an American chemist, whose career at the DuPont Company spanned over forty years. She is most well known for her invention...
Views: 228, Comments: 0
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Challenge Questions

354 blog entries, 28511 comments (1 Viewing)

Tricky Tubes: Newsletter Challenge (July 2017)

This month's Challenge Question: Specs & Techs from GlobalSpec: You are watching TV on an old television set with a cathode ray tube. It’s...
Views: 1123, Comments: 31
Last comment 07/17/2017 by Jpfalt

Satellite Struggle: Newsletter Challenge (June 2017)

This month's Challenge Question: Specs & Techs from GlobalSpec: Column 54 through 61 of a TLE set for the IRIDIUM 20 satellite has a value of -21...
Views: 784, Comments: 3
Last comment 05/31/2017 by Rixter
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Defense & Security Technology

117 blog entries, 1655 comments (0 Viewing)

Multi-touch System Allows Navy Flight Decks to Shuffle Configurations

06/26/2017 by Engineering360 eNewsletter
The systems, designated the Deployable Ship Integration Multitouch Systems, upgrade the "Quija board" currently used to organize hanger bays by allowi...
Views: 122, Comments: 0

Autonomous, Reusable Experimental Spacecraft Being Developed by Boeing and DARPA

06/05/2017 by Engineering360 eNewsletter
Boeing is collaborating with the U.S. Defense Advanced Research Projects Agency (DARPA) to design and test an experimental spaceplane capable of reach...
Views: 159, Comments: 0
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45 blog entries, 407 comments (0 Viewing)

Physicists Create a Fluid With Negative Mass

04/20/2017 by Bayes
One of the interesting things you learn early on in physics is that there is nothing in physics that forbids negative mass values. There has long been...
Views: 792, Comments: 51
Last comment 05/02/2017 by James Stewart

NASA Announcement Today on Potential Habitats for Alien Life

04/13/2017 by Bayes
NASA Announcement Today at 2 p.m. EDT NASA will discuss new results about ocean worlds in our solar system from the agency’s Cassini spacecraft...
Views: 151, Comments: 1
Last comment 04/17/2017 by James Stewart
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"On This Day" In Engineering History

242 blog entries, 842 comments (0 Viewing)

April 19, 1906—The Death of Nobel Prize Laureate Pierre Curie

04/19/2017 by MaggieMc
Thinking back to science class, Curie is a familiar name. Marie Curie is a favorite subject in many courses, especially due to organizing mobile X-ray...
Views: 335, Comments: 2
Last comment 04/20/2017 by MaggieMc

February 17, 1864—The Hunley Sinks the Housatonic

02/17/2017 by Hannes
On this day in 1864, the pioneering Confederate submarine H.L. Hunley rammed and sank the USS Housatonic during the US Civil War. She was the first co...
Views: 434, Comments: 2
Last comment 02/18/2017 by ronc
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Editor's Desk

95 blog entries, 362 comments (0 Viewing)

Engineering Job Growth Shows Positive Outlook

04/08/2017 by Engineering360 eNewsletter
The most recent projections from the U.S. Bureau of Labor Statistics concur that jobs in engineering, and other STEM fields, would likely provide the...
Views: 204, Comments: 0

3D-printed Artwork Created on the International Space Station

02/28/2017 by Engineering360 eNewsletter
The first-ever off-world artwork by Eyal Gever demonstrates what humanity can achieve through positivity, and lightens the mood with laughter in space...
Views: 118, Comments: 0
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Animal Science

238 blog entries, 2171 comments (0 Viewing)

Dogs on the Brain

03/13/2017 by MaggieMc
My good friend just adopted a puppy, and with all the pictures coming my way, I have dogs on the brain. Evidently, so do researchers. Two studies were...
Views: 486, Comments: 11
Last comment 03/16/2017 by James Stewart

Kid’s Best Friend

02/01/2017 by MaggieMc
Last week, “A Dog’s Purpose” was released in theaters. The movie—which “shares the soulful and surprising story of one d...
Views: 271, Comments: 15
Last comment 02/05/2017 by JPool
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The CR4 Admin Blog

101 blog entries, 1492 comments (0 Viewing)

2016 Year in Review & Farewell

03/07/2017 by SavvyExacta
It’s a little late for a 2016 year in review but I thought it was a fitting subject for my final CR4 post. You see, I’m moving on to a new...
Views: 467, Comments: 16
Last comment 03/09/2017 by jdretired

Across Five Years (A CR4 Clip Show)

12/28/2016 by HUSH
It certainly doesn’t happen as much today, in the age of streaming services and binge watching. But up until recently the ‘clip show’...
Views: 252, Comments: 3
Last comment 12/30/2016 by Andrew Westman
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What Is It?

69 blog entries, 1869 comments (0 Viewing)

What is It? for February 2

Do you know what this is? Share your guess! Submitted by CR4 user phph001.
Views: 527, Comments: 9
Last comment 02/07/2017 by ronc
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Abe's Blog

5 blog entries, 69 comments (0 Viewing)

Hypatia of Alexandria – Part 3

11/15/2016 by amichelen
(Note: This is last part of Hypatia of Alexandri) Personal life If we have little knowledge of her scientific achievements, we know even less about...
Views: 333, Comments: 35
Last comment 11/19/2016 by TimONeill

Hypatia of Alexandria – Part 2

11/08/2016 by amichelen
(This is the second part of Hypatia of Alexandria) The ideas developed by the Pythagoreans represent a solid contribution to the scientific knowledge...
Views: 232, Comments: 1
Last comment 11/10/2016 by Bayes
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Rockaholic Adventures

50 blog entries, 611 comments (0 Viewing)

Morphology of Olympus Mons

12/05/2016 by Shawn
After discussing the morphology of Olympus Mons I felt compelled to share my intuition of the shield volcanos existence and morphology strictly throug...
Views: 299, Comments: 5
Last comment 12/08/2016 by Shawn
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Great Engineers & Scientists

145 blog entries, 501 comments (0 Viewing)

The First Lady of Structural Engineering

11/28/2016 by MaggieMc
Elmina Wilson is widely regarded as “the first lady of structural engineering.” Born on September 29, 1870, Elmina came from a family of w...
Views: 451, Comments: 2
Last comment 07/11/2017 by esperanzajpalmer
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65 blog entries, 579 comments (0 Viewing)

The San Fran Skyscraper with a Six-Inch Slant

09/28/2016 by HUSH
Skyscrapers are a lot more to a city than just real estate. They represent financial prosperity and engineering acumen. They transform the identity of...
Views: 925, Comments: 20
Last comment 01/25/2017 by MR. Guest
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TechnoTourist’s Engineering Expeditions

83 blog entries, 490 comments (0 Viewing)

A Piece of Ireland in Texas

08/23/2016 by joeymac
Everyone knows that kissing the Blarney Stone over in Ireland is supposed to give a person the gift of gab and eloquence of speech. I was fortunate en...
Views: 557, Comments: 7
Last comment 08/25/2016 by joeymac
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Other Blog Entries of Interest

Caption This for 3/31/2017

03/31/2017 posted in Caption This!
by lmno24
This week's image: Thanks to Nigh for the submission! Keep in mind we are always looking for submissions, send us photos anytime. Be sure to vote...
Views: 564, Comments: 38
Last comment 04/07/2017 by Randall

Caption This for 3/24/2017

03/24/2017 posted in Caption This!
by MaggieMc
This weeks image: Be sure to vote for your favorite caption! Thanks to Nigh for the submission, we're always looking for more!
Views: 714, Comments: 85
Last comment 04/06/2017 by szwasta

Caption This for 3/17/2017

03/17/2017 posted in Caption This!
by lmno24
This weeks image: Be sure to vote for your favorite caption! Thanks to user sptilton for the submission.
Views: 431, Comments: 20
Last comment 03/20/2017 by Mikerho

Caption This for 3/10/2017

03/10/2017 posted in Caption This!
by MaggieMc
This week's image: Be sure to vote for your favorite caption! Thanks to Solar Eagle for the submission.
Views: 560, Comments: 49
Last comment 03/14/2017 by Mikerho

Caption This for 3/3/2017

03/03/2017 posted in Caption This!
by lmno24
This week's image: Be sure to vote for your favorite caption! Thanks to user Nigh for the submission.
Views: 657, Comments: 52
Last comment 03/10/2017 by MaggieMc