Author Archives: jaejoon

A baby defeats HIV

Just yesterday, scientists announced that a baby who was born infected with HIV was cured of the disease. The doctors diagnosed the mother to be HIV-positive at the time of labor; the baby was at a high-risk of exposure to HIV, and later confirmed to be infected. After 30 hours of birth, the doctors treated the baby with highly active antiretroviral therapy or HAART, a combination of 3 antiretroviral drugs in order to prevent HIV from making home in the baby’s immune cells. The baby was given treatment for 18 months, and half a year later from quitting treatment, its blood showed no sign of infection.

This is the second case of curing the infected of HIV. The first person to defeat HIV is Timothy Brown who received bone marrow transplant from a donor with HIV-resistant genetic mutation, which is found in 1% of European population.

HIV via flickr user: Microbe World

HIV via flickr user: Microbe World

This “breakthrough” may bring hope to children born with HIV, whose number count to 300,000 worldwide in 2011, and comprise about 1% of HIV patients. However, mother-to-baby HIV transmission is 99% preventable if the mother is treated during her pregnancy. Given that most babies with HIV are born in developing countries where only 50% of pregnant women have access to the medicines, it is crucial to urge wealthy countries to increase their support to organizations such as UNAIDS that work for the elimination of mother-to-baby HIV transmission.

HAART is not a cure for HIV patients at later stage of infection as it can only suppress the virus from replicating rather than killing the viruses themselves. Nevertheless, the news of world’s second case of curing HIV gives hope that the virus may be conquered if actions are taken quickly.

More human than just another Artificial Intelligence

Ask your (grand) parents: had they, 30 or 40 years ago, anticipated to live in an era where people carry cell phones, do face time, or shop via the Internet? Some may had imagined to witness today’s technology and some may had not. One of the most debated future technologies that many scientists feel skeptical believing we won’t ever achieve is human-like artificial intelligence. However, new software made last year may bring us closer to creating computers that operate like human brains.

So far there has been a number of artificial intelligences (AI) so smart that one of them has won the quiz show Jeopardy (IBM’s Watson) and another makes video games on its own (Angelina). Artificial Intelligences are programmed to think like people so that if one asks it and a real human a question, he cannot distinguish whether answer is from the real human or an AI. However, AIs do not at all work like human brains do; they are computers pre-programmed only to perform tasks with the data they store.

This time, a team of scientists of the University of Waterloo made an artificial brain that works more similar to ours. Its name is Spaun, acronym for Semantic Pointer Architecture Unified Network. Spaun is a supercomputer with 2.5 million simulated neurons (average human brain has 80 – 100 billion), an eye, and an arm. With its 2.5 million neurons, Spaun processes what it sees with its eye and performs tasks like a human brain would. Below is a video and a summary of some stuff Spaun can do:

YouTube Preview Image

it can recognize, write, count, and remember numbers as well as forgetting them. via Youtube user: CTNWaterloo

The abilities of Spaun may not seem as impressive as AI Watson or Angelina, and even stupid in comparison, taking 2.5 hours in real time per 1 second in the video. However, the importance of Spaun’s birth is that it works like a human brain. With this, scientists can run experiments unethical to perform on human subjects such as killing neurons and observing brain degradationNow that we have an artificial model of human brain, I think we are a little closer to the future where computers will think and make decisions on its own like humans. 

Fire rainbows – not really a rainbow on fire

A fire rainbow, via deviantART user: ~daslasher1 For more pictures from ~daslasher1, click here.

I’m sure we all have seen rainbows after the rain and rosy-hued clouds during the sunset. The rainbows and the sunsets can make beautiful sceneries, but if the two phenomena could happen at once, wouldn’t it be twice as beautiful?

A 22° halo, via wikimedia commons user: Andrzej Barabasz

Indeed, such phenomenon does occur. It is better known to the public as the “fire rainbow,” than its actual name, the “circumhorizontal (or circumhorizon) arc.” Although it is called a fire rainbow, it is neither a rainbow nor is related to fire. It is really a halo that is made by ice crystals in the cloud refracting the sunlight. The circumhorizontal arcs are unlike common halos (22° halos). Whereas 22° halos are seen fairly close to the sun, circumhorizontal arcs form much further, closer and parallel to the horizon. In addition, to observe, the circumhorizontal arc requires specific angles of the sun and a specific kind of cloud.

cirrus cloud, via wikimedia commons user: Saperaud

Firstly, there need to be cirrus clouds.  Cirrus clouds form more than 6000m high, and contain ice crystals in which sunlight is refracted. The arc is brighter if the cloud is thicker, since more crystals will refract more sunlight. Secondly, the sun must be higher than 58°. Such height of the sun is possible only between latitudes 55°N and 55°S. It is impossible to see the circumhorizon arc outside of these latitudes, because the sun will never rise high enough. Fortunately, the latitude of Vancouver is 49°N. This link (click here) shows a graph of months in a year when circumhorizontal arcs can be formed. In Seattle, the arcs may be observed from mid-April through mid-August. Since Vancouver is just north of Seattle, there won’t be much difference.

So, during the summer when the sun is at its highest and if there are some cirrus clouds in the sky, be sure to look around! You may be able to witness a beautiful fire rainbow as these seen in New BrunswickSeattle (and another), and Toronto.