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Jyoti Q Dahiya
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Jyoti Q Dahiya

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Inequity | Gender

What if parents worried more about what their sons would do to strangers than what strangers might do to their daughters?

How many women have faced something the first set of comments some time in their lives? How many men have ever faced anything remotely like the second set of comments?

That's a measure of sexism in society.

From a friend's post on facebook.

#sexism #inequity #gender
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Space | How old is the Moon?

Possibly 4.51 billion years, not much younger than the solar system itself.

This new estimate comes from examining samples of moon rocks returned by the Apollo astronauts. When they brought the samples, there was a lot of fear that they may contain biologically active material, and the material was quarantined for a long time before confirming that the Moon was very very dead, biologically speaking. It also has a solid core, unlike the Earth, whose core is still molten after all these billions of years.

Read more about it in +rasha kamel's post, and the linked article she found for us.

#space #moon #MoonRocks
"It turns out the moon is older than many scientists suspected: a ripe 4.51 billion years old.
That's the newest estimate, thanks to rocks and soil collected by the Apollo 14 moonwalkers in 1971.
A research team reported Wednesday that the moon formed within 60 million years of the birth of the solar system. Previous estimates ranged within 100 million years, all the way out to 200 million years after the solar system's creation, not quite 4.6 billion years ago.
The scientists conducted uranium-lead dating on fragments of the mineral zircon extracted from Apollo 14 lunar samples. The pieces of zircon were minuscule—no bigger than a grain of sand.
"Size doesn't matter, they record amazing information nonetheless!" lead author Melanie Barboni of the University of California, Los Angeles, said in an email.
She noted that the moon holds "so much magic ... the key to understand how our beautiful Earth formed and evolved."
The moon was created from debris knocked off from Earth, which itself is thought to be roughly 4.54 billion years old.
Some of the eight zircon samples were used in a previous study, also conducted at UCLA, that utilized more limited techniques. Barboni said she is studying more zircons from Apollo 14 samples, but doesn't expect it to change her estimate of 4.51 billion years for the moon's age, possibly 4.52 billion years at the most".
It turns out the moon is older than many scientists suspected: a ripe 4.51 billion years old.
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SPACE JUM's profile photoriki kyousuke's profile photoAakash Dave's profile photoJyoti Q Dahiya's profile photo
+Aakash Dave , that's a question that has no simple answer. I'll try to look for material that explains that simply and share it, probably in Feb.
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Puzzle | Cut a square cake into 5 parts, each with equal cake and equal icing

The icing is on the sides and top. The height of the cake is unspecified. The top is square.

Have fun. Then go look at the solutions (link in original post).

From +John Baez via +Kam-Yung Soh

#maths #geometry #CakeSlicing #puzzle
How to fairly share a square cake among 5 people

Suppose you have a square cake of arbitrary height and want to divide it into 5 pieces that all have the same amount of cake and the same amount of icing.

The icing makes it hard.  If there were no icing on the cake, or only icing on top, we could cut the cake in 5 strips of equal thickness. 

But let's assume there's icing on the sides of the cake too!  Since we don't know how tall the cake is, we want to slice the cake vertically into pieces that have equal area on top and contain equal amounts of the outside edge. 

This solution by Tim, a math teacher in Wisconsin, is quite impressive.  Divide each side into 5 parts as shown and cut straight to the center of the cake at C. 

Puzzle 1.  But is this solution correct?

You can see other answers here:

The question was raised by Steven Strogatz on Twitter, and I heard about it from +Alok Tiwari, who heard about it from +Ian Agol.  Some of the answers on the original Twitter thread are really dumb, some are really smart.  It's fun to see them all.

The fun, of course - let's come out and say it! - arises from the gnarly and complicated relationship that the numbers 4 and 5 have with each other.  Squares and regular pentagons don't play nicely, and here Tim is trying to pentisect the square.

Puzzle 2. What's the easiest way to construct a segment of length sqrt(5/4) using ruler and compass?

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T.E. Mark's profile photoJyoti Q Dahiya's profile photoGianmario Scotti (Mario)'s profile photo
That's the most epic Twitter thread, ever.
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Space | Dione, moon of Saturn

Thanks to multiple pictures of Dione, moon of Saturn, taken over a period of time by Cassini, we have this map of the moon.

Like conventional Mercator projections, this distorts the polar areas by giving them more 'area'. But you can clearly see the two hemispheres and their differences.

The right side of the picture shows the 'leading' hemisphere, or the one that is to the front as the moon circles Saturn (it's tidally locked to show the same face to Saturn always). The left side shows the 'trailing' hemisphere, the one that's behind the moon as it travels around Saturn every 2.7 days.

Now, our wait for the scientists to explain the remarkable colour/lightness differences between the two is over (this picture was first released in 2014).

The dark stuff is organic matter that is affected by Saturn's magnetosphere. The light stuff is ice coatings from Saturn's E ring (the rings are mainly ice and some dust). This in turn is mainly made up of ice geysered into space by Enceladus (another moon, on the other side of the E ring) from giant outblasts of water/ice from its poles. These water volcanoes are so big that they are actually visible in pictures of Enceladus' south pole.

The streaks in the dark portion are ice cliffs several hundred metres high. They indicate that Dione, while geologically quiescent, is not geologically dead. Some scientists guess there may be oceans of water under the surface of Dione as well as its more famous watery counterpart, Europa.

The more we find out about the solar system, the more fascinating it becomes.

Via +European Space Agency, ESA

#space #saturn #enceladus #dione #ice #ERingOfSaturn

#SpaceScience image of the week features an icy moon of #Saturn and the 15th largest moon in the Solar System. Meet #Dione , Saturn's icy satellite, in this global colour mosaic of the moon’s intriguing surface produced from images taken by the international #Cassini spacecraft during its first 10 years of exploring the Saturn system. Perhaps the most striking observation is the difference in colour and brightness between the left and right halves of the image. They correspond to the ‘trailing’ and ‘leading’ hemispheres respectively, in terms of the direction that the moon is travelling along its orbit around Saturn every 2.7 days.

Read more:

Credit: NASA/JPL-Caltech/Space Science Institute/Lunar and Planetary Institute
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+Praveen Kumar , more like a moon. :) Earth, having atmosphere and tectonics, shows a lot fewer craters.
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Stories on Google+ | +T.E. Mark | Fractured Horizons

A time travel story about nuclear weapons.

#ScienceFiction #StoriesOnGooglePlus #TEMark #FracturedHorizons #TimeTravel #scifi
Fractured Horizons: (Revised)

An idealist’s dream. A world without atomic weapons because of a boy who learned a valuable lesson.
This is an amusing, often sensitive, thought-provoking, entertaining read with a great message! (The responsibility of being a person of science)

Robert Davie is slipping through time and space. He’s living other people’s lives.
He travels to the past and meets his scientific idols.
He visits potential catastrophic futures.
His guide keeps telling him it’s all part of his training.
The question looms – His training for what?

US -
US -
UK -
CA -

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Stories on Google+ | +T.E. Mark 

I can vouch TE Mark has a light touch with humour and tackles serious subjects with verve.

This book, about immigration (to Mars, but then, why Mars really?), is sure to guide you in your endeavours at interplanetary immigration.

#StoriesOnGooglePlus   #Scifi   #satire   #humour   #TEMark  
…but then, why Mars really?

A deplorably funny and insanely witty satire about how truly bizarre human beings are.

Guaranteed to make you laugh and think and board the next rocket for Jupiter or places unknown.

The quintessential guide to interplanetary immigration.

You should read this.




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Space | Jupiter

JunoCam may well do for Jupiter what Cassini did for Saturn. Of course, Jupiter is a lot more difficult to get near to than Saturn.

Via +annarita ruberto

#space #jupiter #JunoCam
Crescent Jupiter with the Great Red Spot

This image of a crescent Jupiter and the iconic Great Red Spot was created by a citizen scientist (Roman Tkachenko) using data from Juno's JunoCam instrument.
You can also see a series of storms shaped like white ovals, known informally as the "string of pearls."
Below the Great Red Spot a reddish long-lived storm known as Oval BA is visible.

The image was taken on Dec. 11, 2016 at 2:30 p.m. PST (5:30 p.m. EST), as the Juno spacecraft performed its third close flyby of Jupiter. At the time the image was taken, the spacecraft was about 285,100 miles (458,800 kilometers) from the planet.

► JunoCam's raw images are available, for the public to peruse and process into image products, at>>

► More information about Juno is online at>> and

Image Credit: NASA/JPL-Caltech/SwRI/MSSS/Roman Tkachenko

► Source>>

#SolarSystem #Jupiter, #GreatRedSpot, #NASA, #JunoMission
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Human is chasing nature and it's wonders
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Medical research | Breathe out and say aah

Yes, that old staple of doctors, take a deep breath and say aah, may well be the new staple too, with new sensors to diagnose up to 17 different diseases just by breathing on them.

It's not magic. It's that certain diseases alter the chemistry of the body, and some of these chemicals are expelled in the breath. This insight will help in non-invasive testing.

Isn't medical research wonderful?

Via +Kam-Yung Soh

#biology #MedicalResearch #breathalyser #BreathPrints #NaNose
Your breath smells sick. "Physicians have been detecting disease from the smell of breath, urine, and feces for over 2,000 years. Illness can change the metabolism in our bodies, causing our cells to release volatile organic compounds (VOCs), molecules that travel through the bloodstream to the lungs and are exhaled. People with early stage cancer, for example, breathe out different concentrations of VOCs than healthy individuals.
Now, a team of researchers, led by engineer Hossam Haick of the Technion−Israel Institute of Technology in Haifa, reports its latest advances with a simpler, more sophisticated method for detecting disease in the breath. Called the “Na-Nose,” this artificially intelligent nanoarray relies on gold nanoparticles and carbon nanotubes to diagnose and classify 17 different diseases based on a single human breath.

In a December study published in ACS Nano, the researchers for the first time demonstrate clinical proof that diseases have unique chemical patterns, or “breathprints,” that distinguish them from one another. In the study, the Na-Nose used those patterns to distinguish among diseases with 86 percent accuracy, and showed potential to diagnose more than one disease at once."
This easy-to-use nanoarray detects unique chemical patterns in a single exhale
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This is amazing. I'm surprised this is only being discussed now when it seems so obvious. (Ever been to a doctor and had them perform a breathalyzer?)

Great post!
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Inequity | gender

Quick, who discovered the double helix structure of DNA?

If you didn't answer "Rosalind Franklin", you got it wrong. Read more about her and four other awesome talents ignored by history because they were... eek! ... women.

Via +Dianna M

#inequity #gender #sexism #TalentedWomen
Content note: Domestic abuse, rape, sexual assault
Most history books have been written by men, and wouldn't you know it? Those darn, sneaky ladies are nowhere to be found.
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Stories on Google+ | +T.E. Mark | _... But then, why Mars really?

The highly acclaimed guide to interplanetary immigration, from the point of view of an immigrant adjusting to ... Mars. But why, really?

#ScienceFiction #satire #StoriesOnGooglePlus #TEMark #ButThenWhyMarsReally
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Stories on Google+ | +T.E. Mark

I've posted earlier about TE Mark's new novel ( ... But then, why Mars really?).

Here's a blog post he's written recently, which will give you a flavour of his writing style and help you decide to plonk a few bucks on his book(s).

In this one, he advises sci fi writers on how to include cool terms like nanotech in their stories. If you like it, you can read more of his equally cool, nifty and witty posts.

#TEMark #StoriesOnGooglePlus #Scifi #blog
An amusing, but inspring look at the world of the really, really small
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Nam Do
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Maps | Evening out the population

Where would your country go if people moved to countries whose relative area is similar to the relative population of the countries?

India and Pakistan, for one, would be nice and widely separated. That would take care of one trouble spot. Life would not be so nice for the Koreas, though, with their trouble just shifting along with them. And some countries just wouldn't move, like the USA, Yemen and Ireland.

Via +Jamez Frondeskias

#maps #CountriesByArea #CountriesByPopulation
What if the world were rearranged so that the inhabitants of the country with the largest population would move to the country with the largest area? And the second-largest population would migrate to the second-largest country, and so on?

Good thing is that Australia would be in Europe :)
China moves to Russia and India takes over Canada. The Swiss get Bangladesh, the Bangladeshi India. And the U.S.? It stays where it is.
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Amelie Harms's profile photoRandy Sagoo's profile photoJyoti Q Dahiya's profile photo
+Randy Sagoo , there you go. The vanguard has already shifted there. :)
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"Space, the final front ear!"
Science fiction fan, voracious reader, loves puns, cartoons and pretty photos, and anything sciencey.
If you want to be added to my circles, check this and let me know which circles interest you.

Bragging rights
Made it easier for people worldwide to take their spare tyre out of the boot; was the first person to realise software could be sold with advertising (was in print with this before hotmail was launched).
Management consultant