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Jeremy Friedberg
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Looking to incorporate some historical pop-culture into your teaching this Halloween? Check out this version of Build a Body, called Dr. DoNoHarm - built by two Toronto high school students using Spongelab's Build-a-body game engine, and editor.

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Nectar-eating bats have evolved to use several methods to drink. Some bats, like the Pallas’ long-tongued bat, use a lapping method. Hair-like papillae on the bat’s tongue increase the contact area with the nectar, helping to draw the fluid up in viscous globs as the bat repeatedly dips its tongue into the nectar.

The orange nectar bat, in contrast, has a tongue with a long central groove. This bat’s tongue stays submerged as it drinks. Researchers hypothesize that muscle action along the tongue, combined with capillary action in the narrow groove, allow the bat to actively pump nectar up to its mouth. It’s worth noting that the edges of the bat’s tongue do not curl around to touch, so the bat is definitely not using suction as one would with a straw.

Watch:
https://www.youtube.com/watch?v=Fbmpb62tnAQ

Article:
http://gizmodo.com/bats-eating-with-nectar-pumping-tongues-are-weirdly-coo-1732665296

Know more:
http://www.nearfamous.com/Pages/NectarBats.html

#bats   #biodiversity  
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Bugs, Reptiles & Cool Creatures
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Propulsion
For every action there is an equal and opposite re-action.

Gif: Alcohol inside a water cooler bottle strapped to a skateboard is ignited to show propulsion.

#frozenplanet   #science   #propulsion  
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Well it's snowing here in Toronto... and in the spirit of time-wasting on this glorious snow day - and by popular demand - we bring back the classic holiday educational game - Ho Ho Hospital! 

http://www.spongelab.com/interactives/hohohospital/index.cfm

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Strati, the first 3D printed car
Strati’s chassis and body were made in one piece out of a carbon fiber-impregnated plastic on a large-area 3-D printer. The machine put down layer after layer of the material at a rate of 40 pounds per hour.

Strati, was designed by Italian designer Michele Anoé, who won an international competition held by crowdsourcing carmaker Local Motors.  

Know more:
https://localmotors.com/3dprintedcar/

Full article:
http://www.businessinsider.com/3d-printed-car-2014-9

#3dprinting   #3dcar  
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SciTech
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“A number of years ago, when I was a freshly-appointed instructor, I met, for the first time, a certain eminent historian of science. At the time I could only regard him with tolerant condescension. I was sorry of the man who, it seemed to me, was forced to hover about the edges of science. He was compelled to shiver endlessly in the outskirts, getting only feeble warmth from the distant sun of science- in-progress; while I, just beginning my research, was bathed in the heady liquid heat up at the very center of the glow.
 
In a lifetime of being wrong at many a point, I was never more wrong. It was I, not he, who was wandering in the periphery. It was he, not I, who lived in the blaze.I had fallen victim to the fallacy of the ‘growing edge;’ the belief that only the very frontier of scientific advance counted; that everything that had been left behind by that advance was faded and dead.

But is that true? Because a tree in spring buds and comes greenly into leaf, are those leaves therefore the tree? If the newborn twigs and their leaves were all that existed, they would form a vague halo of green suspended in mid-air, but surely that is not the tree. The leaves, by themselves, are no more than trivial fluttering decoration. It is the trunk and limbs that give the tree its grandeur and the leaves themselves their meaning.
There is not a discovery in science, however revolutionary, however sparkling with insight, that does not arise out of what went before."

~ Isaac Asimov, Adding a Dimension ~

#isaacasimov   #historyofscience  
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On 20th September 1952 - scientists confirm that DNA holds hereditary data.
The Hershey–Chase experiments were a series of experiments conducted in 1952 by Alfred Hershey and Martha Chase that helped to confirm that DNA is the genetic material. While DNA had been known to biologists since 1869, many scientists still assumed at the time that proteins carried the information for inheritance because DNA appeared simpler than proteins. In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. 

Hershey and Chase concluded that protein was likely not to be the hereditary genetic material. However, they did not make any conclusions regarding the specific function of DNA as hereditary material, and only said that it must have some undefined role.

Confirmation and clarity came a year later in 1953, when James D. Watson and Francis Crick correctly hypothesized, in their journal article "Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid", the double helix structure of DNA, and suggested the copying mechanism by which DNA functions as hereditary material. Furthermore, Watson and Crick suggested that DNA, the genetic material, is responsible for the synthesis of the thousands of proteins found in cells. They had made this proposal based on the structural similarity that exists between the two macromolecules, that is, both protein and DNA are linear sequences of aminoacids and nucleotides respectively.

Hershey shared the 1969 Nobel Prize in Physiology or Medicine with Max Delbrück and Salvador Luria for their “discoveries concerning the genetic structure of viruses.

Hershey-Chase experiment:
http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120076/bio21.swf::Hershey+and+Chase+Experiment

Paper:
http://jgp.rupress.org/content/36/1/39.full.pdf
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2147348/

Sources:
http://en.wikipedia.org/wiki/Hershey%E2%80%93Chase_experiment
http://www.rsc.org/chemistryworld/Issues/2003/April/story.asp

Reference:
http://www.nobelprize.org/nobel_prizes/medicine/laureates/1969/index.html

#adn   #hersheychase   #medicalhistory  
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