Massive Dolphin Die-Off in Peru May Remain a Mystery

Lun, abr 9, 2012

0 Comments

Massive Dolphin Die-Off in Peru May Remain a Mystery

Thousands of dead or dying dolphins have washed ashore in Peru since January, a marine mystery potentially caused by a combination of stress, pollution and disease By Barbara Fraser and Environmental Health News  | April 6, 2012 LIMA, Peru — When a retired fisherman called to report that about 1,500 dolphins had washed up dead on Peru’s northern coast, veterinarian Carlos Yaipén’s first reaction was, “That’s impossible.” But when Yaipén traveled up the coast last week, he counted 615 dead dolphins along a 135-kilometer stretch of coastline. Now, the death toll could be as high as 2,800, based on volunteers’ counts. Peru’s massive dolphin die-off is among the largest ever reported worldwide. The strandings, which began in January, are a marine mystery that may never[...] 

Continue reading

How the Moon Affects the Date of Easter

Lun, abr 9, 2012

0 Comments

How the Moon Affects the Date of Easter

There can sometimes be discrepancies between the ecclesiastical and astronomical versions for dating Easter By Joe Rao and SPACE.com  | April 6, 2012 FULL MOON: Skywatcher Maxim Senin caught the full moon during the moon’s conjunction with Mars, March 7, 2012, in Long Beach, CA. Says he: “Mars, it’s round and red/orange, but too blurred to see any features in my telescope.” Image: Maxim Senin Friday (April 6) brings us the first full moon of the new spring season. The official moment that the moon turns full is 19:19 UT, or 3:19 p.m. EDT. Traditionally, the April full moon is known as “the Pink Moon,” supposedly as a tribute to the grass pink or wild ground phlox, considered one of the earliest widespread flowers of the spring. Other monikers include the[...] 

Continue reading

¿Hasta que temperatura llega el agua antes de congelarse?

Lun, abr 9, 2012

0 Comments

¿Hasta que temperatura llega el agua antes de congelarse?

La respuesta obvia es 0ºC, pero el agua es una sustancia extraña que rara vez se comporta de la forma esperada. Por ejemplo, si contiene impurezas, el punto en que se congela cae, por eso el agua de mar debe llegar a -2ºC para congelarse. Pero si vuelves el agua increiblemente pura -como lo hizo recientemente un equipo de investigadores de la Universidad de Utah, en Estados Unidos- es más difícil que se transforme en hielo. La temperatura tiene que caer a por lo menos -48ºC para que se solidifique. http://eju.tv/2012/04/por-que-gritamos-ay-cuando-nos-golpeamos/

Continue reading

¿Por qué los seres humanos caminan erguidos?

Lun, abr 9, 2012

0 Comments

¿Por qué los seres humanos caminan erguidos?

Probablemente, porque ahorran energía. La idea -muy popular en una época- de que el hombre llegó a caminar apoyándose sólo en sus piernas para regular la temperatura corporal durante la temporada cálida fue descartada recientemente, porque se demostró que no hubo suficiente presión evolucionaria para que el hombre controlase la temperatura. Otras teorías populares incluyen la noción de liberar las manos para usar herramientas y cargar comida y también que esta forma de andar le permite al ser humano caminar en aguas más profundas. Sin embargo, los más recientes experimentos demostraron que se trata de una cuestión de ahorrar energía. Los investigadores pusieron a un ser humano y a un chimpancé a caminar sobre una cinta. En promedio, los chimpancés utilizaban la misma cantidad[...] 

Continue reading

¿Por qué gritamos ¡ay! cuando nos golpeamos?

Lun, abr 9, 2012

0 Comments

¿Por qué gritamos ¡ay! cuando nos golpeamos?

El sonido seminvoluntario que hacemos cuando nos damos un golpe, nos pinchamos, o nos quemamos un dedo, por ejemplo, es constante en todas las lenguas y todas las culturas. En español solemos decir ¡ay!, los alemanes dicen ¡Ach!, los noruegos ¡Aul! y los chinos ¡Aiya! Pero en todos los casos, es un sonido producido con la boca abierta y una respiración corta. Ésta es la manera más rápida y más simple de hacer un sonido fuerte y, probablemente, evolucionó hasta transformarse en una alarma para avisarle a la tribu sobre la existencia de un peligro. Si el peligro es un animal, el sonido tiene el mismo efecto que mostrar los dientes en forma amenazante. http://eju.tv/2012/04/por-que-gritamos-ay-cuando-nos-golpeamos/

Continue reading

Lewis Page: Medieval warming WAS global – new science contradicts IPCC

Mie, abr 4, 2012

0 Comments

Lewis Page: Medieval warming WAS global – new science contradicts IPCC

More peer-reviewed science contradicting the warming-alarmist “scientific consensus” was announced yesterday, as a new study shows that the well-documented warm period which took place in medieval times was not limited to Europe, or the northern hemisphere: it reached all the way to Antarctica. The research involved the development of a new means of assessing past temperatures, to add to existing methods such as tree ring analysis and ice cores. In this study, scientists analysed samples of a crystal called ikaite, which forms in cold waters. “Ikaite is an icy version of limestone,” explains earth-sciences prof Zunli Lu. “The crystals are only stable under cold conditions and actually melt at room temperature.” Down in the Antarctic peninsula that isn’t a problem, and Lu and[...] 

Continue reading

Puberty Before Age 10: A New ‘Normal’?

Mie, abr 4, 2012

0 Comments

Puberty Before Age 10: A New ‘Normal’?

By ELIZABETH WEIL Published: March 30, 2012 Ainsley, who began showing signs of puberty at age 6, and her mother One day last year when her daughter, Ainsley, was 9, Tracee Sioux pulled her out of her elementary school in Fort Collins, Colo., and drove her an hour south, to Longmont, in hopes of finding a satisfying reason that Ainsley began growing pubic hair at age 6. Ainsley was the tallest child in her third-grade class. She had a thick, enviable blond-streaked ponytail and big feet, like a puppy’s. The curves of her Levi’s matched her mother’s. “How was your day?” Tracee asked Ainsley as she climbed in the car. “Pretty good.” “What did you do at a recess?” “I played on the slide with my friends.” In the back seat, Ainsley wiggled out of her pink parka and looked[...] 

Continue reading

En 2011 hubo más de 80.000 embarazos de adolescentes

Mar, abr 3, 2012

0 Comments

En 2011 hubo más de 80.000 embarazos de adolescentes

Informe Santa Cruz, Cochabamba y La Paz son los departamentos con mayores índices. El Gobierno alista un plan en unidades educativas para prevenir estos casos. Verónica Zapana / La Paz – 28/03/2012 El año pasado, el Ministerio de Salud registró en el país 80.137 embarazos en menores de 20 años. Atribuye gran parte de este índice a la abundante, pero errónea, información sobre educación sexual a la que acceden los jóvenes. De acuerdo con la responsable del programa de Jóvenes del Ministerio de Salud, Cecilia Delgadillo, el embarazo en adolescentes cada vez tiene índices más altos. Las cifras más elevadas corresponden a Santa Cruz, Cochabamba y La Paz. “En 2009 teníamos un registro de 77.889 (embarazos) y en 2011 cerramos los datos con 80.137 mamás adolescentes”, dijo[...] 

Continue reading

No Global Warming For 15 Years

Lun, abr 2, 2012

0 Comments

No Global Warming For 15 Years

New UK Met Office global temperature data confirms that the world has not warmed in the past 15 years. Analysis by the GWPF of the newly released HadCRUT4 global temperature database shows that there has been no global warming in the past 15 years – a timescale that challenges current models of global warming.   The graph shows the global annual average temperature since 1997. No statistically significant trend can be discerned from the data. The only statistically acceptable conclusion to be drawn from the HadCRUT4 data is that between 1997 – 2011 it has remained constant, with a global temperature of 14.44 +/- 0.16 deg C (2 standard deviations.) The important question is whether 15 years is a sufficient length of time from which to draw climatic conclusions that are usually[...] 

Continue reading

Birth Control Pills Have Lasting Effects on Relationships

Vie, mar 30, 2012

0 Comments

Birth Control Pills Have Lasting Effects on Relationships

Using oral contraceptives may affect relationship satisfaction By Janelle Weaver  | March 27, 2012 Birth-control pills are known to affect women’s taste in men, at least in laboratory experiments. Now a study of real-world couples suggests that this pill-related preference change could have long-term consequences for a relationship’s quality and outcome. In the lab, women using oral contraceptives show a weaker preference for masculine men—those with high testosterone levels and the corresponding physical hallmarks—than their non-pill-using counterparts. To investigate this issue in a real-world setting, psychologist S. Craig Roberts of the University of Stirling in Scotland and his collaborators gave online surveys to more than 2,500 women from various countries. According to the[...] 

Continue reading
Página 15 de 53« Primera...510...141516...202530...Última »