As this learn node shows, the recent publicity and concern for concussion injuries in sports provides a demonstration of the way networking online knowledge can produce comparative studies from distant fields. When it comes to helmets, history, sports and brain science form a focused network of ideas from all three fields.
Earlier this month, the National Athletic Trainers Association issued a press release describing their new campaign for sports concussion education. The release explains:
The Centers for Disease Control estimate that 300,000 brain injuries occur in sports each year. Of these reported concussions, an estimated 63,000 occur among high school athletes. Even though these numbers alone suggest that concussions represent a significant public health concern, it is likely that many athletes with concussions fail to report their symptoms to medical personnel.
The New York Times today is carrying the story of a new football helmet being developed by former Harvard quarterback Vin Ferrara. The football helmet in the image above is from an interactive graphic that can now be used freely online because of the NY Times new open content policy.
There is, of course, nothing new about the need to protect the human head from blows. Helmet designers have been scratching their heads for centuries to come up with a better way to prevent battering brains by external blows.
The image of the Roman helmet in the graphic above is a Helmet of a Thracian Gladiator on exhibit at the Louve Museum in Paris, France and on their museum website. In this caption the Louvre curators describe the helmet�where there is, like modern sports helmets, distinctive decoration as well as protective features:
Several examples of highly enveloping helmets of this type have been found at Pompeii. They were part of the equipment used by the most heavily armed gladiators – those from the northeast of Greece, the “Thraces” (Thracians), and those from Gaul, the “mirmillones”. The shell of the helmet is highly rounded, with a broad brim, and has a crest decorated with overlapping plumes and terminating in a griffin’s head. This mythological creature was the companion of Nemesis, the goddess of fate, who was venerated by gladiators (there was often a chapel dedicated to her inside the amphitheater). On the front of the helmet, the silver-plated head of the Gorgon Medusa stands out. On either side of the helmet are plume holders to which feathers were attached. The face and neck of the gladiator were protected by a movable visor made up of four riveted plates, two of them solid, the other two pierced.
One of the marvelous resources for open education are museums. Because textbooks must be brief and general, the helmet of a Thracian Gladiator would not survive the first round of editing battles.
Head injury in the past was invisible. A Thracian helmet designer or doctor would have been unable to look inside the skull to see the brain injury of a gladiator whose head had been struck in battle. But today, we can examine brain injuries inside the brain with methods like Computed Tomography (CT) of the head, which is also to be found among open knowledge resources online.
To venture into the future, how about a look at cloning brains in 3D animation of androids at Tufts University?
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Tufts University offers Opencourseware like sample in this learn nod for a variety of scientific and other subjects. One of the courses, which you can click to is 
