Our bodies are comprised of a vast array of elements, with oxygen, carbon, hydrogen, and nitrogen remaining the most abundant. But there are many other chemical elements present! The figure above lists each element that has been isolated from the human body in the order of decreasing mass.
This chart is based on the work of Ed Uthman, who derived the data from The Elements, by John Emsley.
¿de qué estamos hechos? Un buen gráfico para verlo
Even for people who don’t have diabetes or high blood sugar, those with higher blood sugar levels are more likely to have memory problems, according to a new study published in the October 23, 2013, online issue of Neurology®, the medical journal of the American Academy of Neurology.
The study involved 141 people with an average age of 63 who did not have diabetes or pre-diabetes, which is also called impaired glucose tolerance. People who were overweight, drank more than three-and-a-half servings of alcohol per day, and those who had memory and thinking impairment were not included in the study.
Bajos niveles de glucosa son buenos para el cerebro
The Orionid meteor shower takes place in October and November each year, peaking in mid-October. The Orionids are noted for being bright and quick fragments, according to NASA, with an average speed of about 148,000 mph (238,000 kph).
The Orionids, like all meteor showers, are named after the constellation in which they appear to come from, which in this case is Orion the Hunter. While the constellation is best visible in the Northern Hemisphere, the meteor shower is visible in both the northern and southern hemispheres. Orion’s location is:
Right ascension: 5 hours Declination: 5 degrees Latitudes: Between 85 and -75 degrees
"The Orionids are also framed by some of the brightest stars and planets in the night sky, which lend a spectacular backdrop for these showy meteors," NASA wrote on a web page about the annual shower.
Remnants from this shower, as well as the Eta Aquarids in May, come from Halley’s Comet. The comet is the most famous “periodic” visitor to the inner solar system, swinging by the sun every 76 years. It was last visible from Earth in 1986, and will not approach the area again until 2061. The comet leaves behind a debris trail of small fragments, into which Earth plows twice a year.
Although meteors can look bright in the night sky, they result from very small fragments of comets and other debris. A typical meteor fragment is the size of a dust grain, or perhaps a tiny pebble. In the case of the Orionids, these fragments came from Halley’s Comet as it approached the sun. The heat of the sun melts the conglomeration of ices on comets as they approach, leaving a trail of dust and debris in the comet’s wake.