Relativity Science Calculator - Testimonials . In the future you will receive a little piece of software to bring up Relativity Science Calculator directly from within this web pageRelativity Science Calculator


Relativity Science Calculator


From Prof. Max Tegmark, MIT:

Here otherwise is what I received from a Professor Tegmark, MIT, last
evening, and I accept as a mark of recognition:

Subject: Re: Reciprocal Link Exchange Request
Date: February 5, 2007 9:29:44 PM EST

Hi Don,
Thanks for your message. This indeed looks like a nice site. The page
you mention is merely a tombstone for a past course and won't be
edited further, but I'll keep this in mind if I teach this relativity
course again.
Thanks again,
Prof. Max Tegmark
Dept. of Physics, MIT
70 Vassar Street Rm. 37-626B
Cambridge, MA 02139

Subject: Amazing
Date: September 25, 2011 4:58:56 AM GMT-04:00


I don't really know who is behind the site relativity science calculator, but I would like to congratulate the ower of the site. The documents are amazing, the scientific description of all the most famous theories clear and easily understandable, the videos and illustrations astonishing.

Well, thank you very much for this work, for all our children around the world !

Best regards


Subject: Web Form Submission
Date: December 9, 2011 10:49:30 AM GMT-05:00

The following information was submitted on December 9, 2011 @ 10:49 am:


Name: Frederick Koh

State Province: Select a State or Province

Country: Singapore


Contact: email

Comments: Good Day,

I am a teacher who specialises in teaching Cambridge A level H2  maths and CIE 9231 Further Maths in Singapore-I stumbled upon your site while going through the Math web ring and  really loved what you have shared. I am humbly hoping you would consider posting my website link on your site to enhance and complement the learning process for students in general. I have specifically created 2 free question/answer resource portals on my site to help students-namely "the question locker" and "Beyond H2 maths"( majority of the content caters to early college maths) My site's URL is for your reference and consideration, and I  sincerely hope that you will accord me this opportunity to network with you. Thank you and god bless.

Best Regards,
Mr Koh


Date: December 9, 2011 8:26:15 PM GMT-05:00

Honestly words can't describe how brilliant your site is, and your students ( in fact the online community) are very lucky to have you around. I share your passion for imparting knowledge, but even in Singapore very often examination preparations unfortunately ruin the learning atmosphere as grades matter more than thoroughly appreciating the underlying concepts/theories in lessons taught.

Last but not least, a very merry christmas to you, your family and your students too! Take care and god bless.

Best Regards,
Mr Koh

From: Amarashiki
Subject: Relativity Science Calculator
Date: January 27, 2013 12:21:52 PM EST

Dear Don Zi:

First of all, I found your site interesting, specially it can be useful for children too, not only to some experts. I am a Physicist, Master Degree, and well, I am happy to see this kind of resources when I find them, specially since I have always been stubborn with computing and programming, so I value them very much. Be proud of your site. It deserves the effort you put in it!

Keep working on your site! It can be useful even for experts in the field of Physics as a resource for many kind of students!

Faithfully yours,



From: Dr. David Wexler

Subject: Re: In Pdf: Using Black Holes to Measure the Universe's Rate of Expansion - Title: "Super - Eddington Accreting Massive Black Holes as Long-Lived Cosmological Standards"
Date: April 26, 2013 4:48:51 PM GMT-04:00

Hi Don.

This Doppler section is very clear and nicely developed.



Dr. David Wexler, M.D., MS Astronomy

Assistant Professor of Otolaryngology, University of Massachusetts Medical School


My earlier email message to Dave Wexler without any expectation of a reply:

I will presently put this latest research discovery into Relativity Science Calculator as follows:

For some rudimentary techniques in calculating body masses, see:

The Don

Relativity Science Calculator

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