Another very mathy week gone by... some things that caught my attention, AND a special note below:

**1)**This was different... from

*a post about math, poetry, the Fibonacci sequence, and Zeckendorf’s theorem:*

**Futility Closet****http://www.futilitycloset.com/2015/01/11/math-and-poetry/**

**2)**Jason Rosenhouse offers up an "

*especially clever and elegant proof*" of the Pythagorean Theorem":

**http://tinyurl.com/pyjy4f5**

**3)**Last weekend,

**NPR**'s

**RadioLab**re-ran their wonderful episode on "

*Numbers*":

**http://www.radiolab.org/story/91697-numbers/**

...definitely worth a listen if you've never heard it, or worthy of a second listen if you have! (covers some cognitive psychology, Benford's Law, ErdÃ¶s numbers, and Steven Strogatz's "

**Calculus of Friendship**").

**4)**Another piece this week on the frustrations surrounding Mochizuki's asserted proof of the ABC conjecture:

http://www.zmescience.com/science/math/mathematician-numbers-12012014/

**As she often does, Joselle Kehoe connects up the neuroscience of mathematics, cognition, and abstraction in a post earlier in the week:**

5)

5)

**http://mathrising.com/?p=1230**

**6)**Presh Talwalkar goes over the "game theory" of airfare pricing (as highlighted by a recent airline lawsuit against a consumer website):

**http://tinyurl.com/o3o5t89**

**7)**Alex Bellos reports on the newly-discovered "Harriss spiral," stemming from earlier golden-ratio work:

**http://tinyurl.com/lnlxnsz**

The latest "

*" also looks at the Harriss spiral:*

**MathMunch**http://mathmunch.org/2015/01/15/harriss-spiral-math-snacks-and-set/

**8)**The latest "

*Carnival of Mathematics*" has been posted:

http://www.andrewt.net/blog/posts/carnival-of-mathematics-118

**9)**Cathy O'Neil offered a link to her Prezi talk on data journalism at the recent JMM meeting in San Antonio:

**http://tinyurl.com/pkrjptl**

**Another episode of "avoiding thinking in math class" from Ben Orlin:**

10)

10)

http://mathwithbaddrawings.com/2015/01/14/mmm-strawberry-rhuburb-root-2/

**11)**Manifolds, triangulation, and weird topology conjectures, from

**Quanta Magazine**(interesting, if you can follow along the topology!):

https://www.quantamagazine.org/20150113-a-proof-that-some-spaces-cant-be-cut/

**As many already know, the obituary of Alexander Grothendieck (by Mumford and Tate) that drew some controversy weeks ago, has now been published in**

12)

12)

**Nature**(and is freely accessible for another 10 days or so):

**http://tinyurl.com/nx9l2xf**

**13)**More on designing the "flipped classroom" from Crystal Kirch:

http://flippingwithkirch.blogspot.com/2015/01/flipping-with-kirch-designing-flipped.html

**14)**An old 'birds in a lorry' physics puzzle solved, supposedly:

**http://tinyurl.com/pj3m2wv**

and another fascinating physics-related piece (by Tom Siegfried) here, on "quantum math":

**http://tinyurl.com/otfgkzc****15)**Per usual, check out

**MikesMathPage**to see what Mike Lawler and the boys have been up to this week (I haven't had time to follow him much this week :-( :

**http://mikesmathpage.wordpress.com/**

**16)**And earlier in the week I re-looked at an older Ian Stewart book that I now recommend to all math fans:

http://mathtango.blogspot.com/2015/01/letters-from-mathematician.html

*Closing Note:*Lastly, a bit unusual... but a shoutout or tip-of-the-hat to Ed Frenkel who this last week (in the wake of the Charlie Hebdo killings) conducted an amazing

*very*different views, through dozens of tweets back-and-forth. Mathematicians are

*NOT*all about equations and formulas only!

You don't need to go back and read through the long

Some of the essence of what Dr. Frenkel tweeted is covered in this talk he gave a few months back regarding 'no easy answers' and 'life is not a paragraph' (no technical math here):

**https://www.youtube.com/watch?v=YnqQ-BWMHrE**

The last 15 minutes-or-so (it's a 38-min. talk) are among the 15 most evocative minutes you may ever encounter from a professional mathematician -- try to find time for this video if you've not already viewed it.

[And on Sunday morning, in light of Charlie Hebdo, in light of Ed Frenkel, in light of the MLK Holiday (U.S.) on Monday, and in light of so much going on in our world today, the

*'Sunday reflection' will stray a little from the usual fare.]*

**Math-Frolic**
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