On This Day, 29th April 1770,  Captain James Cook  First Landed At Botany Bay,  (Sydney, Australia).

New CDC Research Debunks Agency’s Assertion That Mercury in Vaccines Is Safe

The CDC study, Alkyl Mercury-Induced Toxicity: Multiple Mechanisms of Action, appeared last month in the journal, Reviews of Environmental Contamination and Toxicology. The 45-page meta-review of relevant science examines the various ways that mercury harms the human body. Its authors, John F. Risher, PhD, and Pamela Tucker, MD, are researchers in the CDC’s Division of Toxicology and Human Health Sciences, Agency for Toxic Substances and Disease Registry.

“This scientific paper is the one of most important pieces of research to come out of the CDC in a decade,” Paul Thomas, M.D., a Dartmouth-trained pediatrician who has been practicing medicine for 30 years, said. “It confirms what so many already suspected: that public health officials have been making a terrible mistake in recommending that we expose babies and pregnant women to this neurotoxin. I regret to say that I gave these shots to children. The CDC led us all to believe that it was perfectly safe.”

Among the findings of the CDC’s new study:

Methylmercury, the highly-regulated neurotoxin found in fish, and ethylmercury (found in medical products, including influenza and tetanus vaccines, ear drops and nasal sprays) are similarly toxic to humans. Methylmercury and ethylmercury share common chemical properties, and both significantly disrupt central nervous system development and function.

Thimerosal is extremely toxic at very low exposures and is more damaging than methylmercury in some studies. For example, ethylmercury is even more destructive to the mitochondria in cells than methylmercury.

The ethylmercury in thimerosal does not leave the body quickly as the CDC once claimed, but is metabolized into highly neurotoxic forms.

Curves of constant width

                                                    Source

The width of a circle is constant: its diameter.

But the circle is not the only shape that holds this pristine title. For instance let’s look at the Reuleaux triangle

Reuleaux triangle

A Reuleaux triangle is a shape formed from the intersection of three circular disks, each having its center on the boundary of the other two.

The Reuleaux triangle is the first of a sequence of Reuleaux polygons, curves of constant width formed from regular polygons with an odd number of sides.

Some of these curves have been used as the shapes of coins

To drill square holes.

They are not entirely square, their edges are fillets i.e the edges are rounded and not sharp.

This animation offers a good insight as to why that is so.

And in china, apparently on bicycles.

The man Guan Baihua shows his self-made multi-angle-wheel bicycle on May 6, 2009 in Qingdao of Shandong Province, China. Guan Baihua spent 18 months to complete this strange bicycle.

Other shapes of constant width

There are other shapes of constant width beside the Reuleaux triangle ( that has been discussed in this post ), a whole bunch of them really. Do take a look at them. ( links below )

I will leave you guys with my favorite one.

More:

If this post fascinated you, i strongly suggest you check these out. They go in-depth with the mathematics that underlies these curves and talk about other cool stuff:

An animation of non-circular rollers

Shapes and Solids of Constant Width - Numberphile  

Shapes of constant width

Reuleaux Polygons,           

Edit:

For those who are wondering if these are something that one would stumble upon on a regular basis. You may not find perfect ones but similiar ones definitely.

I found mine on a really old BMI calculator thingy. ( not sure what you would call it )

Have fun exploring !

Categorizing Posts on Tumblr

Millions of posts are published on Tumblr everyday. Understanding the topical structure of this massive collection of data is a fundamental step to connect users with the content they love, as well as to answer important philosophical questions, such as “cats vs. dogs: who rules on social networks?”

As first step in this direction, we recently developed a post-categorization workflow that aims at associating posts with broad-interest categories, where the list of categories is defined by Tumblr’s on-boarding topics.

Methodology

Posts are heterogeneous in form (video, images, audio, text) and consists of semi-structured data (e.g. a textual post has a title and a body, but the actual textual content is un-structured). Luckily enough, our users do a great job at summarizing the content of their posts with tags. As the distribution below shows, more than 50% of the posts are published with at least one tag.

However, tags define micro-interest segments that are too fine-grained for our goal. Hence, we editorially aggregate tags into semantically coherent topics: our on-boarding categories.

We also compute a score that represents the strength of the affiliation (tag, topic), which is based on approximate string matching and semantic relationships.

Given this input, we can compute a score for each pair (post,topic) as:

where

w(f,t) is the score (tag,topic), or zero if the pair (f,t) does not belong in the dictionary W.

tag-features(p) contains features extracted from the tags associated to the post: raw tag, “normalized” tag, n-grams.

q(f,p) is a weight [0,1] that takes into account the source of the feature (f) in the post (p).

The drawback of this approach is that relies heavily on the dictionary W, which is far from being complete.

To address this issue we exploit another source of data: RelatedTags, an index that provides a list of similar tags by exploiting co-occurence patterns. For each pair (tag,topic) in W, we propagate the affiliation with the topic to its top related tags, smoothing the affiliation score w to reflect the fact these entries (tag,topic) could be noisy.

This computation is followed by filtering phase to remove entries (post,topic) with a low confidence score. Finally, the category with the highest score is associated to the post.

Evaluation

This unsupervised approach to post categorization runs daily on posts created the day before. The next step is to assess the alignment between the predicted category and the most appropriate one.

The results of an editorial evaluation show that the our framework is able to identify in most cases a relevant category, but it also highlights some limitations, such as a limited robustness to polysemy.

We are currently looking into improving the overall performances by exploiting NLP techniques for word embedding and by integrating the extraction and analysis of visual features into the processing pipeline.

Some fun with data

What is the distribution of posts published on Tumblr? Which categories drive more engagements? To analyze these and other questions we analyze the categorized posts over a period of 30 days.

Almost 7% of categorized posts belong to Fashion, with Art as runner up.

The category that drives more engagements is Television, which accounts for over 8% of the reblogs on categorized posts.

However, normalizing by the number of posts published, the category with the highest average of engagements per post isGif Art, followed by Astrology.

Last but not least, here are the stats you all have been waiting for!! Cats are winning on Tumblr… for now…

+heroes of nusantara: multatuli

YES, I, Multatuli, “who have suffered much,”—I take the pen. I do not make any excuses for the form of my book,—that form was thought proper to obtain my object…. I will be read! Yes, I will be read. I will be read by statesmen who are obliged to pay attention to the signs of the times; by men of letters, who must also look into the book of which so many bad things are said; by merchants, who have an interest in the coffee auctions; by lady’s-maids, who read me for a few farthings; by governors-general in retirement; by ministers who have something to do; by the lackeys of these Excellencies; by mutes, who, more majorum, will say that I attack God Almighty, when I attack only the god which they made according to their own image; by the members of the representative chambers, who must know what happens in the extensive possessions over the sea which belong to Holland….  

Ay, I shall be read!

Eduard Douwes Dekker was born in Amsterdam, March 2nd 1820. His father was a ship’s captain and intended for his son to have a career in trade. This humdrum prospect disgusted Douwes Dekker and in 1838 he obtained a post as a civil servant on the island of Java. During the period between 1848 and 1851 Douwes Dekker eventually rose to serve as assistant resident in various regencies in the Indonesian archipelago including Natal, North Sumatra, Manado in Sulawesi and Ambon in the Moluccas. In 1857 he was transferred to Lebak, in the Bantam residency of Java (now Banten province). By this time, however, all the secrets of Dutch administration were known to him, and he had begun to openly protest about the abuses of the colonial system. Consequently, he was threatened with dismissal from his office for his openness of speech. Douwes Dekker resigned his appointment and returned to the Netherlands.

He was determined to expose in detail the scandals he had witnessed, and he began to do so in newspaper articles and pamphlets. Little notice, however, was taken of his protestations until, in 1860, he published his novel Max Havelaar under the pseudonym of Multatuli. Douwes Dekker’s new pseudonym, which is derived from Latin, means, “I have suffered much”, or, more literally “I have borne much” referring to himself, as well as, it is thought, to the victims of the injustices he saw. An attempt was made to suppress the inflammatory book, but in vain; it was read all over Europe. Apologists for colonialism accused Douwes Dekker’s horrific depictions of being exaggerated.

[ his statue in amsterdam ]

Although it was translated into English in 1868, the text wasn’t available in the author’s home country until over a century later in 1972. Collectively, Multatuli’s Max Havelaar has been translated into 34 different languages worldwide since its initial publication. Credited as the stirring initiation of the nationalist movement responsible for the termination of Dutch colonization of Indonesia following World War II, Max Havelaar’s legacy is not confined to literary accomplishment, but can be considered a work of great political success and inspired social liberation. Max Havelaar’s influence on the national movement ultimately culminated in the passionate command to end decolonization worldwide. The story of Max Havelaar illuminates the inhumane and political injustices brutally imposed upon the native peoples of the region.

Sigmund Freud listed Multatuli as one of his favorite writers. Multatuli’s brother, Jan Douwes Dekker, was the grandfather of Ernest Douwes Dekker (also known as Danudirja Setiabudi, a National Hero of Indonesia). There is a museum for him in Amsterdam. Multatuli is also known as the person who coined the term emerald of equator, a poetic nickname of Indonesia.

This book is an introduction….  I shall increase in strength and sharpness of weapons, according as it may be necessary.    Heaven grant that it may not be necessary!…    No, it will not be necessary! For it is to thee I dedicate my book: WILLIAM THE THIRD, King, Grand Duke, Prince,… more than Prince, Grand Duke, and King,… EMPEROR of the magnificent empire of INSULIND, which winds about the equator like a garland of emeralds!…    I ask THEE if it be thine IMPERIAL will that the Havelaars should be bespattered with the mud of Slymerings and Drystubbles; and that thy more than thirty millions of SUBJECTS far away should be ill treated and should suffer extortion in THY name!

source: wikipedia; culture trip

quotes from bartleby, excerpt of max havelaar

further reading: paper on multatuli

Southeast Asia’s Ramayana Epic Versions.

The Ramayana epic is well known in many parts of Asia as the Homer’s Iliad is to the West. It is a story with many versions of the tale, told throughout South and Southeast Asia and shows the history and influence of Hinduism throughout the Southeast Asian region. Here is a list of the well known versions from different countries in SEA. Some differ and have been adapted to the local culture but all tell the same tale.

1.) Indonesia ~ Kakawin Ramayana

Kakawin Ramayana is an Old Javanese rendering of the Sanskrit Ramayana in kakawin meter. It is believed to have been written in Central Java (modern Indonesia) in approximately 870 AD during the era of Medang Kingdom. Kakawin Rāmâyaṇa is a so-called kakawin, the Javanese form of kāvya, a poem modeled on traditional Sanskrit meters. Among the Javanese, Kakawin Ramayana has always been considered the pinnacle of artistic expression. The large number of preserved manuscripts attest to it popularity and adaptation. It is the lengthiest of all the Old Javanese kakawins of the Hindu-Buddhist period of Java.

2.) Myanmar ~ Yama Zatdaw

Yama Zatdaw is the Burmese version of the Ramayana. There are nine known pieces of the Yama Zatdaw in Myanmar. The Burmese name for the story itself is Yamayana, while zatdaw refers to the acted play or being part of jataka tales of Theravada Buddhism. The Yama Zatdaw was introduced by oral tradition during King Anawratha’s reign although it was not known clearly whether the story was Valmiki’s Sanskrit epic Ramayana or not. In the Nathlaung Temple, the Visnu temple, within the walls of old city Bagan, there are some stone sculptures, one of which is Ramachandra. Based on Burmese literature, at least, Hanuman has been known in Burma definitely before 1527 AD.

3) Thailand ~ Ramakien

The Ramakien (รามเกียรติ์, “Glory of Rama”, sometimes also spelled Ramakien) is Thailand’s national epic, derived from the Hindu epic Ramayana. The word is derived from Sanskrit word Ramakhyan (Ram + Akhyan) where Akhyan means a long story or epic. A number of versions of the epic were lost in the destruction of Ayutthaya in 1767. Three versions currently exist, one of which was prepared in 1797 under the supervision of (and partly written by) King Rama I. His son, Rama II, rewrote some parts of his father’s version for khon drama. The work has had an important influence on Thai literature, art and drama (both the khon and nang dramas being derived from it). While the main story is identical to that of the Ramayana, many other aspects were transposed into a Thai context, such as the clothes, weapons, topography, and elements of nature, which are described as being Thai in style. Although Thailand is considered a Theravada Buddhist society, the Hindu mythology latent in the Ramakien serves to provide Thai legends with a creation myth, as well as representations of various spirits which complement beliefs derived from Thai animism. A painted representation of the Ramakian is displayed at Bangkok’s Wat Phra Kaew, and many of the statues there depict characters from it.

4.) Philippines ~ Darangen

The Philippines is one of the last places in Southeast Asia where most people wouldn’t expect influences of Hinduism & Buddhism in the culture and country. Yet despite heavy colonization and Westernization, many parts of the Philippines were Indianized and practiced a form of Hinduism & Buddhism as the rest of Southeast Asia. Traces of that history can still be found in artifacts recovered and in epics. One such epic is the Darangen of the Maranao. Darangen comes from two root words, meaning “to narrate in song.” The Darangen was first told in the fourteenth century A.D. The Darangen Epic of the Maranaos, including the Maharadia Rawana, is an indigenized version of the Ramayana. Most people believe that the popular traditional Singkil dance  is indigenous to the Maguindanao ethnic group or to the Maranao ethnic group in Mindanao or both. But in fact, the Singkil is a Maguindanao and Maranao interpretation of the Ramayana epic, as retold in the Darangen Epic, where the original polytheistic accounts were restated and transformed to conform to monotheistic Islam to which the Maranaos and Maguindanaos adhere. Note,however, that the Singkil is not religious and it is not Muslim. It is a secular dance of the Maranaos and the Maguindanaos, the majority of whom are Muslims.

5.) Laos ~ Phra Lak Phra Lam

Phra Lak Phra Ram is the national epic of the Lao people, and is adapted from Valmiki’s Hindu epic, the Ramayana. Similar to some Malay versions of the Hikayat Seri Rama, the epic has lost the association with Hinduism and is instead considered a Jataka Story, a previous lifetime of the Buddha. It is also very popular in Northeastern Thailand, or Isan, a region of Thailand mostly populated by ethnic Lao and formerly part of Lanxang.

6.) Malaysia ~ Hikayat Seri Rama

Hikayat Seri Rama is the Malay literary adaptation of the Hindu Ramayana epic. The main story remains the same as the original Sanskrit version but some aspects of it were slightly modified to a local context such as the spelling and pronunciation of names. Numerous branch stories had also been developed as accretions to or extensions of this epic with the upgrading of minor characters to major ones, or the invention of totally new characters. For example, Malay writers and storytellers have produced variations in which Laksmana (Lakshman) plays a larger role, sometimes becoming more important than Rama the elder prince much like the Lao Phra Lak Phra Lam. Rama, although righteous and virtuous, was perceived to be weak and his character is often moved to the background while the younger Laksmana is admired for his courage and willingness to react decisively.

7.) Cambodia ~ Reamker

Reamker is a Cambodian epic poem, based on the Sanskrit’s Ramayana epic. The name means “Glory of Rama”. It adapts the Hindu ideas to Buddhist themes and shows the balance of good and evil in the world. More than just a reordering of the epic tale, the Reamker is a mainstay of the royal ballet’s repertoire. Like the Ramayana, it is a philosophical allegory, exploring the ideals of justice and fidelity as embodied by the protagonists, Prince Rama and Queen Sita. The epic is well known among the Khmer people for its portrayal in Khmer dance theatre, called the Lkhaon, in various festivals across Cambodia. Scenes from the Reamker are painted on the walls of the Royal Palace in Khmer style, and its predecessor is carved into the walls of the Angkor Wat and Banteay Srei temples. It is considered an integral part of Cambodian culture. The Reamker differs from the original Ramayana in some ways, featuring additional scenes and emphasis on Hanuman and Sovanna Maccha. In the Reamker, issues of trust, loyalty, love, and revenge play out in dramatic encounters among princes and giants, monkeys and mermaids, and a forlorn princess. Though it is understood that Preah Ream is an incarnation of the Hindu god Vishnu, his characteristics and those of the others in the story are interpreted in Cambodia as those of mere mortals, not of the gods as is the case in India. The complex interplay of strengths and weaknesses, though couched in episodes lined with magic, nonetheless represents a decidedly human social behavior.

Photo Sources: [x], [x], [x], [x], [x], [x], [x]

Molecule of the Day: Dopamine

Dopamine (C8H11NO2) is an important neurotransmitter involved in many signalling pathways in the body. At room temperature, it is a white powder that is freely soluble in water.

Dopamine plays a key role in the brain’s reward system and is associated with feelings of euphoria and pleasure. As a result, stimuli that cause greater amounts of dopamine to bind to the corresponding receptors on the post-synaptic membrane induce appetitive behaviour.

For example, drugs such as amphetamine bind to and inhibit dopamine reuptake transporters present on the pre-synaptic membrane, and can also inhibit monoamine oxidase, which normally metabolises dopamine. This causes the concentration of dopamine in the synaptic cleft to increase, and the resultant rise in binding of dopamine receptors leads to feelings of pleasure. However, in combination with the resultant tolerance, this can lead to addiction and dependence on such drugs.

Dopamine is biosynthesised from tyrosine in the human body, via the intermediacy of L-DOPA:

Low dopamine levels have been linked to Parkinson’s disease; this is because the main symptoms arise from the death of dopamine-producing cells in the brain. Consequently, one of the main methods of treating it is the injection of L-DOPA; while this does not recover the cells’ ability to produce dopamine, it can stimulate the remaining cells, and is also metabolised to form dopamine (see above).

Four years of failed harvests (1695, 1696, and 1698–99) resulted in severe famine and depopulation, particularly in the north of Scotland. Starvation killed 5 to 15 percent of the Scottish population, but in areas such as Aberdeenshire, death rates reached 25 percent.

Rarely has a natural disaster had such wide-ranging historical consequences as did the famine that struck Scotland in the mid-1690s. Little more than a decade later, as Scotland’s social elites despaired about their nation’s grinding poverty and profound structural weakness, the country’s Parliament finally voted away its age-old independence in favor of unification with England, previously Scotland’s bitterest and most enduring enemy.

The author of this sermon was a very colorful figure. A Scottish Presbyterian minister denounced as a rebel in 1674, he was restored next year but arrested again the following February. Later he was arrested for refusing to pray for the Prince of Wales, but again released. His matrimonial adventures were no less robust than his professional career. He was married seven times and fathered at least nine children.

David Williamson (1636- 1706). Scotland’s sin, danger, and duty: faithfully represented in a sermon preach’d at the West-Kirk, August 23d, 1696: being a solemn fast-day upon occasion of the great dearth and famine. Rare BT162.F3 W54 1720 

Superfluid Helium

It was previously thought that superfluid Helium would flow continuously without losing kinetic energy. Mathematicians at Newcastle University demonstrated that this is only the case on a surface completely smooth down to the scale of nanometers; and no surface is that smooth.

When a regular fluid like water is passing over a surface, friction creates a boundary layer that ‘sticks’ to surfaces. Just like a regular fluid, when superfluid Helium passes over a rough surface there is a boundary layer created. However the cause is very different. As superfluid Helium flows past a rough surface, mini tornados are created which tangle up and stick together creating a slow-moving boundary layer between the free-moving fluid and the surface. This lack of viscosity is one of the key features that define what a superfluid is and now we know why it still loses kinetic energy when passing over a rough surface.

Now we can use this information to help our efforts on applications of superfluids in precision measurement devices such as gyroscopes (I think this was on the Big Bang theory where they make a gyroscope using superfluid Helium that can maintain angular momentum indefinitely because it would flow across a smooth surface without losing kinetic energy) and as coolants.

Did You Know Large Wine Bottles Have Special Names?

Wine bottle names are… odd. Once you get large enough, the wine holders become named after biblical kings:

1.5 L Magnum: Equivalent to two standard 750 ml bottles.

3.0 L Double Magnum: Equivalent to two Magnums or four standard 750 ml bottles.

4.5 L Jeroboam : Equivalent to six standard 750 ml bottles.

6.0 L Imperial: Equivalent to eight standard 750 ml bottles or two Double Magnums. Why they stopped using kings here I don’t know.

9.0 L Salmanazar: Equivalent to twelve standard 750 ml bottles or a full case of wine!

12.0 L Balthazar: Equivalent to sixteen standard 750 ml bottles or two Imperials.

15.0 L Nebuchadnezzar: Equivalent to twenty standard 750 ml bottles.

Interestingly, I looked around and could not find why the names are what they are. The names just appeared, I guess, and everyone agreed to use them.

1984

George Orwell