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Peter Collingridge
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Khan Academy content creator, part-time bioinformatician, former molecular biologist
Khan Academy content creator, part-time bioinformatician, former molecular biologist

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#RandomExperimentSundays : I was curious if char-rnn (https://github.com/karpathy/char-rnn) can generate new, fun and plausible baby names. So I got a dataset of 8,000 baby names from an NLP repo (http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/areas/nlp/corpora/names/), trained a 2-layer LSTM and generated some.

To my amusement many fun unique names come out and 90% of them are not found in the training data. Here are 100 example samples that do not occur in training data:

Rudi
Levette
Berice
Lussa
Hany
Mareanne
Chrestina
Carissy
Marylen
Hammine
Janye
Marlise
Jacacrie
Hendred
Romand
Charienna
Nenotto
Ette
Dorane
Wallen
Marly
Darine
Salina
Elvyn
Ersia
Maralena
Minoria
Ellia
Charmin
Antley
Nerille
Chelon
Walmor
Evena
Jeryly
Stachon
Charisa
Allisa
Anatha
Cathanie
Geetra
Alexie
Jerin
Cassen
Herbett
Cossie
Velen
Daurenge
Robester
Shermond
Terisa
Licia
Roselen
Ferine
Jayn
Lusine
Charyanne
Sales
Sanny
Resa
Wallon
Martine
Merus
Jelen
Candica
Wallin
Tel
Rachene
Tarine
Ozila
Ketia
Shanne
Arnande
Karella
Roselina
Alessia
Chasty
Deland
Berther
Geamar
Jackein
Mellisand
Sagdy
Nenc
Lessie
Rasemy
Guen
Gavi
Milea
Anneda
Margoris
Janin
Rodelin
Zeanna
Elyne
Janah
Ferzina
Susta
Pey
Castina

Here is a much bigger sample: http://cs.stanford.edu/people/karpathy/namesGenUnique.txt

Some of my favorites include "Baby" (haha), "Killie", "Char", "R", "More", "Mars", "Hi", "Saddie", "With" and "Ahbort". Well that was fun.
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This is what I mainly been working on over the last year and a half.
Pixar in a Box - Explore The Math & Science Behind Pixar's Film in These Exciting Online Courses For Kids, Teens & The Curious-Minded
Pixar, in partnership with Khan Academy, have launched an exciting educational program geared towards kids and teens (or the curious-minded) to learn about the math and science that helps bring their films to life called, Pixar in a Box . The series of free...
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A rope is supported at its ends. What shape do you think it assumes? Galileo though parabola, in red. Wrong! The right answer, so called catenary, is very close.

The curve described by a uniform chain hanging from two supports in a uniform gravitational field is called a catenary, a name apparently coined by Thomas Jefferson. If the sag is mall, so that the weight is about uniformly distributed, the curve is close to a parabola, a quadratic curve, but the catenary is a hyperbolic cosine curve, y = a cosh(x/a), where x is measured from the lowest point. The tension in the chain increases from that at the lowest point toward the points of support. Because all the load is vertical, the horizontal component of the tension is constant. A uniform cable also hangs in a catenary; the essential thing is that there is negligible transverse stiffness.

The curve can be inverted to form an arch, in which the tension becomes a compression, least at the highest point and increasing downward. If the arch is uniform, the compressive stress will follow the catenary curve and there will be no tendency to buckle. If the load is horizontally uniform, the curve will be a parabola. The St. Louis Gateway Arch is an example. Since the arch is smaller in cross section at the top, the curve is a flattened catenary.

Continue reading : http://mysite.du.edu/~jcalvert/math/catenary.htm

#mathematics   #maths   #physics   #science  
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When I first saw Ad Reinhardt's picture I thought it was another ridiculous modern art piece, but I was won over by the description of how it was made in this video:
https://www.khanacademy.org/humanities/art-history/art-history-1907-1960-age-of-global-conflict/American%20Modernism/v/moma-painting-technique-reinhardt

I made my own tribute to it (which can be made easier to see) here:
https://www.khanacademy.org/cs/tribute-to-ad-reinhardt/2763817823
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