Science | ||||
Are we all descended from a common female ... - Science
Are we all descended from a common female ... - Science
science.howstuffworks.com/life/evolution/female-ancestor.htm
Dr. Wesley Brown noticed that when you compare the mtDNA of two humans, the ... many women who came after, but her life is the point from which all modern ... five main populations on the planet: African, Asian, European, Australian and ..Modern Europeans descended from three groups of ancestors
Hyderabad: A new study has shown that the present-day Europeans trace their ancestry to three and not two ancestral groups.
Representational picture
"We find a major surprise: Europeans are a mixture of three ancient populations, not two," said David Reich from Harvard Medical School, one of the lead investigators.
The results were published in the prestigious science journal 'Nature' recently, CCMB said.
An international consortium led by researchers from the University of Tubingen and Harvard Medical School along with those from CCMB analyzed ancient human genomes from the bodies of a 7,000 year-old early farmer from the linearbandkeramik (LBK), a sedentary farming culture from Stuttgart in southern Germany; a 8,000 year old hunter-gatherer from the Loschbour rock shelter in Luxembourg, and seven 8,000 years old hunter-gatherers from Motala in Sweden.
To compare the ancient humans to the present-day people, the team also generated genome-wide data from about 2,400 humans from almost 200 diverse worldwide contemporary populations, including the enigmatic tribal population of Andaman and Nicobar Islands, said senior principal scientist at the CCMB Kumarasamy Thangaraj, one of the authors of the study.
The findings were published in the journal Nature.
The Sun Will Eventually Engulf Earth-- Scientific ...
The Sun Will Eventually Engulf Earth-- Scientific ...
Aug 18, 2008 - The sun is slowly expanding and brightening, and over the next few billion years it will ... About 7.6 billion years from now, the sun will reach its maximum size as a red giant: its surface ... at about three millimeters a year, or only 0.0002 AU by the sun's red giant phase. ... jslymm34 August 5, 2009, 1:53 PM.
Study: Sun Will End Earthly Life in 2.8 Billion Years
Study: Sun Will End Earthly Life in 2.8 Billion Years
news.nationalgeographic.com/.../131028-earth-biosignature-doomsday-s...
Oct 28, 2013 - The planet will become too hot for even the hardiest microbes. ... Things will get toasty for existing life-forms long before that red giant stage is ... By about 2.8 billion years from now, only hardy communities of ... "Only the hardiest microbes will be able to cope with this, until even ..... 5 Sky Events This Week.Only 5 billion years until The Milky Way gets gobbled up
Only 5 billion years until The Milky Way gets gobbled up
According to a new study published in the Monthly Notices of the Royal Astronomical Society, galaxies turn to cannibalism when they get too big to keep growing on their own.
"All galaxies start off small and grow by collecting gas and quite efficiently turning it into stars," Aaron Robotham, a postdoctoral researcher at the International Centre for Radio Astronomy Research and head of the study, said in a statement. "Then every now and then they get completely cannibalized by some larger galaxy."
As galaxies grow, they get worse at making new stars -- but they also have stronger gravity, which helps them pull neighbors into the fold. The Milky Way reached this tipping point "recently," in cosmic terms (read: not at all recently) and will now grow mostly by snacking on the little guys. It's been a while since our neighborhood ate another one, but astronomers can still see the signs of former galaxies that we've digested.
But The Milky Way isn't going to be able to outrun Andromeda. In about 5 billion years we'll collide with the nearby galaxy, which contains at least twice as many stars as our own. To Andromeda, we'll be nothing but a cosmic candy bar.
These cannibalistic mergers will continue until the whole universe is made of just a few gigantic galaxies, but that's a long way off -- a destiny we won't reach until the Universe is many times older than it is today.
Direct Brain-to-Brain Messaging Using Computer Interface Demonstrated
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September 5, 2014 07:44 BST
Soldiers
in combat could benefit from the brain-to-brain communication that uses
a computer interface to code and encode electric signals.(Reuters)
They transmitted the words 'hola' and 'ciao' in binary code from the brain of a person in India to the brains of three people in France, reports ANI.
The team of researchers from Starlab Barcelona, Spain and Axilum Robotics, Strasbourg, France, used internet-linked electroencephalogram (EEG) and robotised transcranial magnetic stimulation (TMS) technologies to transmit the message.
Electrodes attached to a person's scalp recorded electrical currents in the brain as a person was asked to consciously think about an action like moving an arm or leg. The computer interpreted the signal and translated it to a robotic control output. A second human brain was included on the other end of the system.
Four healthy adults participated in the study. One of them was assigned to the brain-computer interface (BCI) branch and was the sender of the words; the other three were assigned to the computer-brain interface (CBI) branch of the experiments and received the messages.
Using EEG, the research team first transmitted the electrical signal accompanying the greetings 'hola' and 'ciao' into the computer, then translated this into binary code and then emailed the results from India to France.
The recipients, blindfolded, received electric pulses from the robotised TMS system in the visual cortex of their brains. This triggered the experience of phosphenes, or seeing flashes of light that are not actually there. The record of these flashes when reported were translated into binary code and translated into the message.
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