En tan solo veinte años, la nebulosa de la Mantarraya ha perdido su brillo y su llamativa forma.
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Finds in Etruscan tombs suggest that as early as 700 BC. c. partial dentures were used in the present-day territory of Tuscany, Italy.
Some were permanently attached to existing teeth, and others were removable.
The first European sets of dentures date back to the 15th century, although as mentioned above, they existed long before then. The teeth were carved from bone or ivory, or were simply prepared from teeth recovered from cemeteries, since apparently there were dead or even living donors.
Throughout history, as more knowledge has been acquired and techniques have been perfected, the materials with which dental prostheses are manufactured have varied. From primitive replacements with ivory and even natural human and animal teeth, to the most current and innovative materials.
And the most expensive
A set of false teeth from the president of the United States George Washington (1732-99) is insured for ten million dollars. It is currently on display at Mount Vernon, Washington's former home, in Virginia. What was it made of? Made of hippopotamus ivory, among other materials. Modern historians suggest that George Washington lost his teeth at a young age due to the mercury oxide he took to treat diseases such as smallpox and malaria.
The most expensive false teeth sold at auction were the British Prime Minister's wartime dentures. Winston Churchill, which sold for $23,703.
That figure is triple the estimated price, and the bidder took it on July 29, 2010.
The most expensive individual tooth sold at auction, however, was one belonging to John Lennon, the ex-Beatle. On November 5, 2011, the Canadian dentist Michael Zuk He bought this molar for $36,857. Apparently, Lennon had given the tooth to his maid.
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The news
These are the oldest (and also the most expensive) false teeth
was originally published in
Xataka Science
by
Sergio Parra
.
It has already been suggested to us in A study conducted with firefighters that men who can do 40 push-ups in a minute are 96 percent less likely to have cardiovascular disease than those who do fewer than 10.
Another new study from the University Hospital of A Coruña presented at 'EACVI – Best of Imaging 2020', a scientific congress of the European Society of Cardiology, indicates that Climbing four flights of stairs (60 steps) in less than a minute indicates good heart health.
Heart health
The study included 165 patients referred for exercise testing due to known or suspected coronary artery disease. Exercise capacity was measured as metabolic equivalents (MET).
Participants walked or ran on a treadmill, gradually increasing the intensity and continuing until exhaustion. After resting for 15 to 20 minutes, patients were asked to climb four flights of stairs (60 steps) at a fast pace without stopping, but also without running, and the time was recorded.
The researchers analyzed the relationship between the METs achieved during the exercise tests and the time it took to climb four flights of stairs.
Patients who climbed the stairs in less than 40-45 seconds achieved more than 9-10 METs. Previous studies have shown that 10 METs during an exercise test are related to a low mortality rate (1% or less per year, or 10% in 10 years). However, patients who took 1.5 minutes or more to climb the stairs achieved fewer than 8 METs, which translates to a mortality rate of 2 to 4 percent per year, or 30 percent over 10 years.
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The news
Climbing 60 steps in less than a minute would indicate good heart health, according to this study
was originally published in
Xataka Science
by
Sergio Parra
.
Amazing little arachnauts!
This could help save lives.