Cover photo
Jonas Neergaard-Nielsen
Works at Technical University of Denmark
Attended University of Copenhagen Faculty of Science
Lives in Copenhagen, Denmark
13,076 followers|1,148,881 views
Have him in circles
13,076 people
kald sakr's profile photo
Jinath Premaratne's profile photo
Ben Ransom's profile photo
groupenumériqueamis markzuckerberg's profile photo
Karrington Atkins's profile photo
Chris Smith's profile photo
Robert Johansson's profile photo
Robert Bevins's profile photo
antonio alfaro's profile photo
Quantum optician
  • Technical University of Denmark
    Post doc, 2011 - present
  • National Institute of Information and Communications Technology, Tokyo
    Post doc, 2008 - 2011
  • Niels Bohr Institute, University of Copenhagen
    PhD student, 2005 - 2008
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Copenhagen, Denmark
Tokyo, Japan - Hundested, Denmark
Turning mirrors, for a more efficient life
Science, photography, LEGO, making, design, technology, Denmark, Japan and more - my G+ may be as messy as my brain...
  • University of Copenhagen Faculty of Science
    Physics, 1999 - 2005
  • Frederiksværk Gymnasium
    1996 - 1999
Basic Information
Other names
Jonas Schou Neergaard-Nielsen
Apps with Google+ Sign-in


The Atlantic's feature on Islamic State's understanding of Islam and how they see their mission and rationalise their brutal rule is very well worth the long read.

What previously seemed to me like pure, irrational madness now at least makes some kind of sense. It doesn't really make them any less scary, though. 
The Islamic State is no mere collection of psychopaths. It is a religious group with carefully considered beliefs, among them that it is a key agent of the coming apocalypse. Here’s what that means for its strategy—and for how to stop it.
Eugene Cottrell's profile photoDavid Billa's profile photo
ALL religion is scary.  Every ounce of it.  From the dark depths of ISIS to the seemingly innocent back row of a Methodist church.  Just think of all the death caused by 'my God is better than your God'.  It's ridiculous.  I am sick of it.  Sick of watching it happen.  Sick of hearing it.  Sick of zealotry and bigotry.  Why can't we just be humanity?
Add a comment...
Rob Whitworth is a timelapse god. That's all.

via +PetaPixel
Samuel Penn's profile photoMarcin W.'s profile photo
Add a comment...
Nice plug for the International Year of Light. Thanks +Koen De Paus​.
The many hands that make light work want you to see it anew

Physicists around the world are gearing up for the International Year of Light and Light-based Technologies (IYL), which kicks off later this month at an official opening ceremony at the headquarters of the United Nations Educational, Scientific and Cultural Organization (UNESCO) in Paris. Some 1500 delegates are set to converge on the French capital for the event, which runs from 19 to 20 January, and will include representatives from the UN and UNESCO as well as the Nobel laureates Zhores Alferov, Steven Chu, Serge Haroche and William Phillips.

Honestly, they couldn't have picked a better year. 2015 marks the anniversary of several important milestones in the study of light, including the 1000th anniversary of the publication of Ibn al-Haytham's seven-volume treatise on optics. Alhazen's work transformed the way in which light and vision was understood, earning him the title the "father of modern optics". 200 years ago Fresnel proposed that light behaved like a wave, 150 years ago James Clerk Maxwell published his Dynamical Theory of the Electromagnetic Field, a 100 years ago Einstein embedded light in cosmology through general relativity and it's been 50 years since Wilson and Penzias discovered the cosmic microwave background.

"One of the most exciting aspects of this International Year is the way in which it brings together such a wide range of different communities, from astronomy to medicine and photonics to arts and culture," says Beth Taylor, chair of the UK National Committee for the IYL. "It creates a unique opportunity to cross traditional cultural divides and engage new and different audiences with the excitement of light and its applications."

The IYL will consist of a series of co-ordinated events around the world to communicate the importance of light and optical technologies in society – ranging from the Story of Light Festival in Goa, India, to Worldwide Pinhole Photography Day. Hundreds of events are planned in countries all around the world. 

You can find out about events near you using light2015's event programme;

If you haven not yet seen the amazing BBC4 series Light Fantastic, make this the year you do. -

“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.” -Plato

Some other interesting links;
A History of Light -
The electromagnetic radiation spectrum -
The Light of my Life -

#ScienceSunday  | +ScienceSunday   
View original post
Add a comment...

Jonas Neergaard-Nielsen

Shared publicly  - 
Wow. Never heard of this people or their remarkable constructions before. What a place to live!
White House Ruin

I took this photo from the bottom of Canyon de Chelly, in Arizona. These buildings, called the White House Ruin, were built around 1200 AD.  A bit later, the civilization that built them disappeared!

They're called the Anasazi, or Ancient Pueblo People.  Starting around 800 AD, they started building great houses: multi-storied buildings with high ceilings, rooms much larger than you'd see in houses, and elaborate subterranean rooms called kivas. And around 900 AD, they started building houses with stone roofs. We call this the start of the Pueblo II Era.

For a long time their civilization was centered in Chaco Canyon, in New Mexico, 125 kilometers east of Canyon de Chelly.  Their biggest great house was founded in the 800s.  Starting in 1020 it grew immensely, and it kept growing until 1120. By this time it had 700 rooms, nearly half devoted to grain storage. It also had 33 kivas.

But this was just one of a dozen great houses built in Chaco Canyon by 1120. About 215 thousand ponderosa pine trees were cut down in this building spree!  Building these houses probably took over 2 million man-hours of work. They also built about 650 kilometers of roads!  Most of these connect one great house to another… but some mysteriously seem to go to ‘nowhere’.

By 1080, however, the summer rainfall had started to decline. And by 1090 there were serious summer drought lasting for five years. We know this sort of thing from tree rings: there are enough ponderosa logs and the like that archaeologists have built up a detailed year-by-year record.

Starting around 1100 AD, many of the ancient Pueblo people left the Chaco Canyon area. Many moved upland, to places with more rain and snow. Instead of great houses, many returned to building the simpler pit houses of old.

By 1150 AD, some of the ancient Pueblo people began building cliff dwellings at higher elevations—like Mesa Verde in Colorado  This marks the start of the Pueblo III Era.  The settlements in Canyon de Chelly, shown here, date to 1200.   But this era lasted a short time. By 1350, all these cliff dwellings were abandoned!

The people didn't leave... they're still around.  But they stopped building large settlements.   Why?  For some answers, read my article:

#archaeology #history  
14 comments on original post
Add a comment...
If you're looking for some enjoyable, insightful, enlightening reads, perhaps for inspiration for the new year, you can't go wrong with +Brain Pickings. Here, +Maria Popova has gathered her best 20 articles of 2014. So much good stuff to dive into!
The psychology of the perfect daily routine, how to criticize with kindness, the creative purpose of boredom, Kafka on what books do for the
Samuel Holmes's profile photo
Add a comment...
One more for Tokyo Tower.

Khin Maung Saing's profile photo
Add a comment...
According to Spotify, I was pretty obsessed with The National in 2014.
I do feel that my music listening patterns were considerably more varied than what their My year in music indicates, both in terms of genres and artists, but there's no doubt that I've been into The National, Arctic Monkeys and Nick Cave (recently) way more than other artists this year.

Watch I Need My Girl

#thenational   #spotify   #obsession  
Here’s how I played in 2014. How did you play? #Spotify2014
Add a comment...
Have him in circles
13,076 people
kald sakr's profile photo
Jinath Premaratne's profile photo
Ben Ransom's profile photo
groupenumériqueamis markzuckerberg's profile photo
Karrington Atkins's profile photo
Chris Smith's profile photo
Robert Johansson's profile photo
Robert Bevins's profile photo
antonio alfaro's profile photo

Jonas Neergaard-Nielsen

Shared publicly  - 
An atom interferometer - a reasonably simple tabletop experiment - has been used to test a specific model for dark energy. Cool!
New experiment doesn’t see fifth force, rules out class of dark energy models
Sketch of new experiment. Fig 1 from arXiv:1502.03888 Three months ago, I told you about a paper that suggested a new way to look for certain types of dark matter fields, called “chameleon fields” . Chameleon fields can explain the observed accelerated expa...
Sketch of new experiment. Fig 1 from arXiv:1502.03888 Three months ago, I told you about a paper that suggested a new way to look for certain types of dark matter fields, called “chameleon fields”. Chameleon fields can explai...
View original post
iPan Baal's profile photo
Add a comment...

Jonas Neergaard-Nielsen

Shared publicly  - 
Why, oh why didn't they use a colour camera?? Totally awesome, though. The full video is not for the faint of heart!

The giant Humboldt squid First squid cam

Scientists working with a remote imaging team at National Geographic decided to put camera sweaters - tubes of Lycra-like material - on a few Humboldts to get a squid’s eye view of easily one of their most interesting behavior: Color-flashing communication. Scientists aren’t sure what the squid are trying to say, but they are fairly certain they are communicating with each other. Humboldt squid do this by rapidly squeezing cells in their skin called chromatophores and turning their whole bodies from white to red and back again. This flashing can change speed and direction on the skin in response to all kinds of squid interactions, from mating attempts to displays of aggression. But which patterns the squid show off have yet to be mapped onto some kind of color vocabulary.

Paper: Chromogenic behaviors of the Humboldt squid (Dosidicus gigas) studied in situ with an animal-borne video package
Journal of Experimental Biology:

Longer video National Geographic Crittercam:
3 comments on original post
Gert Sønderby's profile photoJonas Neergaard-Nielsen's profile photoPatrick Smith's profile photo
This is a must see!
Add a comment...

Jonas Neergaard-Nielsen

Shared publicly  - 
Happy calendar exchange!

This is the traditional new year cake in Denmark, kransekage. Eaten with a toast of champagne right after midnight, it is a sweet thing made from marcipan and egg white - and with extra almond and sugar for good measure.
It's supposed to have a decorative icing, but I think the little mischievous fellow here licked it off while I wasn't looking ;-)

I wish everybody a sweet 2015!
Jonas Neergaard-Nielsen's profile photoMichael Swanson's profile photoMarialuisa Bagliani's profile photoUri Palatnik's profile photo
The elf thought so too, +Himitsu Animo​ :-) 
Add a comment...

Jonas Neergaard-Nielsen

Shared publicly  - 
Basile Audoly and Sébastien Neukirch won the 2006 Ig Nobel prize for figuring out why spaghetti snaps into multiple pieces. Here's +SmarterEveryDay on the case with a super high-speed camera. 
Sweet physics in your kitchen! :)
The secret of snapping spaghetti at up to a quarter of a million frames per second. Courtesy +SmarterEveryDay
2 comments on original post
Ed Greshko's profile photoClara Osorio's profile photoJonas Neergaard-Nielsen's profile photo
Yeah, with a high speed camera (and a really bright lamp) I'm sure we could learn something new every day!
Add a comment...
Today is the birthday of Tokyo Tower - and of the Japanese Emperor and roughly 20 million other living souls. Happy birthday to you all! :)

deepshikkha pariha's profile photoKathryn Huxtable's profile photoSandeep Gulla's profile photoTwinkle Star's profile photo
Sure does, +Denise Case​!
Add a comment...
Jonas Neergaard-Nielsen's +1's are the things they like, agree with, or want to recommend.
Thomas Müller not to blame for Pepe's headbutt during Germany's 4-0 win ...

World Cup 2014: Germany's hat-trick striker Thomas Müller exaggerated his reaction to a shove by Pepe but defender was then deservedly sent

The Lego Movie: review - Telegraph

The Lego Movie, which has characters voiced by Will Ferrell and Liam Neeson, is an an uproariously funny family adventure, says Robbie Colli

Janne In Osaka: Happy New Year

From Sweden, but I've been living in Osaka for nine years. I've worked in cognitive science, neuroscience and robotics. I am affiliated with

Static Interactive Widgets for IPython Notebooks

My Afternoon Hack: IPy-Widgets. I've been thinking about this issue for the past few weeks, but this morning as I was biking to work through


ISSA hasn't shared anything on this page with you.

Dansk forsker teleporterer med en killing

Nu kan forskerne bruge en særlig lysstråle kaldet en Schrödingers killing til teleportation. Metoden kan på sigt føre til kvantecomputere og


Python is a remarkably powerful dynamic programming language.

Man-Made Objects Spotted in Nature

Norwegian photographer Rune Guneriussen photographs man-made objects in nature as if they belonged there. The objects are arranged to look l

Faceless Portraits With Low-Key Lighting

Shape is a series by French photographer Quentin Arnaud that consists of minimalistic portraits shot with low-key lighting. The stark lighti

Tae Kim's Guide to Learning Japanese

Find everything you need to learn Japanese including comprehensive guides, tutorials, and video.

Magical Photos of Insects Shot Using Ordinary Household Objects

The photographs in Nadav Bagim's project "WonderLand" might look like paintings or computer generated images, but they're actually real phot

Incredible Photograph of the Milky Way Rising Over the Sea

Photographer Yasuaki Segawa captured this incredible photograph of the Milky Way rising above the ocean, as seen from Taketomi Island, Japan

Waterfall, Moonbow, and Aurora Captured in a Single Shot

Photographer Stephane Vetter managed to capture a moonbow, an aurora, and an Icelandic waterfall, all in the same photograph. The longer

How to Make a Photo of a Bouncing Baby

An earlier post here on PetaPixel showcased a wonderful image of a flock of cell phones and the method used to create it. In a rather snarky

Amazing Photographs of Wrapped Trees

Photographer Zander Olsen creates amazing optical illusions by wrapping trees with white linen, lining up the ends of the material with the

GIMP Magazine

Premiere GIMP Users Magazine

Any.DO To-do List & Task List

Millions use Any.DO every day to remember all the tasks they want to-do and make sure they get them done. Key benefits: Seamless cloud sync,

WordPress Theme Development - A Guide to the Options

In this article, we’ll look at some of the different wordpress theme options, and how to develop them, with tips on which approach might be