How 250 Siberians Became The First Native Americans

How 250 Siberians Became the First Native Americans

How 250 Siberians Became The First Native Americans

The Americas are a big place, but the Native American group that first settled it was small — just about 250 people, according to a new genetic study.

These people, known as a founding group because they “founded” the first population, migrated from Siberia to the Americas by about 15,000 years ago, said study co-lead researcher Nelson Fagundes, a professor in the Department of Genetics at Federal University of Rio Grande do Sul, in Brazil.

Figuring out the size of founding groups is key, because it determines the amount of genetic diversity that gets passed on to the group’s descendants, Fagundes said.

That, in turn, could alter how effectively natural selection weeds out bad genes, Fagundes said.

“Large populations have very efficient selection, while in small populations, mildly deleterious alleles [versions of genes] can spread, which may increase genetic susceptibility to some diseases,” Read more.

More Posts from In-pursuit-of-knowledge-blog and Others

ive been reading a book that basically explains how so-called “brain differences” between the genders is the result of gendered socialization and not the cause of it. i honestly expected the book to be very cis-centric but its actually the opposite, the author stresses that testimony from trans ppl is actually indispensable because we’ve, in a sense, “lived both experiences”

more cis feminists should have this mindset


Tags
So I Will Admit I Was Feeling Funny About Going To The Field Museum Because Of The Whole “look At Display
So I Will Admit I Was Feeling Funny About Going To The Field Museum Because Of The Whole “look At Display

So I will admit I was feeling funny about going to the Field Museum because of the whole “look at display of objects from colonized groups” thing. Especially because of the Black Panther post with commentary on museums.

But boy, the Field Museum really does seem to be doing a fair amount towards rectifying past attitudes and actions. I took these two pictures and there were at least two others I wish I had remembered to take pictures of. I was thrilled to see such obvious mentions of this kind of thing instead of a lack of change or pretending it didn’t happen.

@kaijutegu I’ve been meaning to post these for the past few days, every time I see the BP museum post go by again!


Tags

“There have been too great a tendency to call anyone ‘impractical’ who dare to look too far in advance of the well beaten path. What is being ‘practical’? One must have imagination in order to be truly practical.

"I know scientific men who have spent years in attempts to do some obviously impossible thing and who yet have been called 'practical’ because if they succeeded in accomplishing that for which they were striving they would make much money.

"The same man would have jeered not long ago at the suggestion that we on the earth might receive signals from Mars. Big things are not 'practical’. They are wonderful. Many scientific minds, like many minds which are not scientific, shy at anything which is wonderful. Yet the simplest things in nature are wonderful almost beyond the limits of the human imagination.

"Men ignorant of the way in which plants grow would jeer at a farmer if suddenly they should be so placed that they saw him planting seeds. They would declare him an impractical creature because the fruition of his efforts if at all possible of realization is so remote. They want immediate results.

"The sending to and reception from Mars of signals would be an achievement by no means as wonderful as Nature’s simple process of making seeds grow in the ground.”

–Nikola Tesla

“Marconi Credits Mystery Flash To Far Planet”New York Sun, January 25, 1920.

“There Have Been Too Great A Tendency To Call Anyone ‘impractical’ Who Dare To Look Too Far In

Tags

10 Things: Journey to the Center of Mars

May the fifth be with you because history is about to be made: As early as May 5, 2018, we’re set to launch Mars InSight, the very first mission to study the deep interior of Mars. We’ve been roaming the surface of Mars for a while now, but when InSight lands on Nov. 26, 2018, we’re going in for a deeper look. Below, 10 things to know as we head to the heart of Mars.

image

Coverage of prelaunch and launch activities begins Thursday, May 3, on NASA Television and our homepage.

1. What’s in a name? 

image

“Insight” is to see the inner nature of something, and the InSight lander—a.k.a. Interior Exploration using Seismic Investigations, Geodesy and Heat Transport—will do just that. InSight will take the “vital signs” of Mars: its pulse (seismology), temperature (heat flow) and reflexes (radio science). It will be the first thorough check-up since the planet formed 4.5 billion years ago.

2. Marsquakes. 

You read that right: earthquakes, except on Mars. Scientists have seen a lot of evidence suggesting Mars has quakes, and InSight will try to detect marsquakes for the first time. By studying how seismic waves pass through the different layers of the planet (the crust, mantle and core), scientists can deduce the depths of these layers and what they’re made of. In this way, seismology is like taking an X-ray of the interior of Mars.

Want to know more? Check out this one-minute video.

3. More than Mars. 

image

InSight is a Mars mission, but it’s also so much more than that. By studying the deep interior of Mars, we hope to learn how other rocky planets form. Earth and Mars were molded from the same primordial stuff more than 4.5 billion years ago, but then became quite different. Why didn’t they share the same fate? When it comes to rocky planets, we’ve only studied one in great detail: Earth. By comparing Earth’s interior to that of Mars, InSight’s team hopes to better understand our solar system. What they learn might even aid the search for Earth-like planets outside our solar system, narrowing down which ones might be able to support life.

4. Robot testing. 

InSight looks a bit like an oversized crane game: When it lands on Mars this November, its robotic arm will be used to grasp and move objects on another planet for the first time. And like any crane game, practice makes it easier to capture the prize.

Want to see what a Mars robot test lab is like? Take a 360 tour.

5. The gang’s all here. 

image

InSight will be traveling with a number of instruments, from cameras and antennas to the heat flow probe. Get up close and personal with each one in our instrument profiles.

6. Trifecta. 

image

InSight has three major parts that make up the spacecraft: Cruise Stage; Entry, Descent, and Landing System; and the Lander. Find out what each one does here.

7. Solar wings. 

Mars has weak sunlight because of its long distance from the Sun and a dusty, thin atmosphere. So InSight’s fan-like solar panels were specially designed to power InSight in this environment for at least one Martian year, or two Earth years.

8. Clues in the crust. 

image

Our scientists have found evidence that Mars’ crust is not as dense as previously thought, a clue that could help researchers better understand the Red Planet’s interior structure and evolution. “The crust is the end-result of everything that happened during a planet’s history, so a lower density could have important implications about Mars’ formation and evolution,” said Sander Goossens of our Goddard Space Flight Center in Greenbelt, Maryland.

9. Passengers. 

image

InSight won’t be flying solo—it will have two microchips on board inscribed with more than 2.4 million names submitted by the public. “It’s a fun way for the public to feel personally invested in the mission,” said Bruce Banerdt of our Jet Propulsion Laboratory, the mission’s principal investigator. “We’re happy to have them along for the ride.”

10. Tiny CubeSats, huge firsts. 

image

The rocket that will loft InSight beyond Earth will also launch a separate NASA technology experiment: two mini-spacecraft called Mars Cube One, or MarCO. These suitcase-sized CubeSats will fly on their own path to Mars behindInSight. Their goal is to test new miniaturized deep space communication equipment and, if the MarCOs make it to Mars, may relay back InSight data as it enters the Martian atmosphere and lands. This will be a first test of miniaturized CubeSat technology at another planet, which researchers hope can offer new capabilities to future missions.

Check out the full version of ‘Solar System: 10 Thing to Know This Week’ HERE. 

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com. 


Tags
This Sheep Skull I Found In Is Particularly Round! Look At That Crazy Nose. And Its Eye Sockets Are Huge. 

This sheep skull I found in is particularly round! Look at that crazy nose. And its eye sockets are huge.  Maybe its a different breed from the rest?


Tags
“[…] All Things Are One Thing And That One Thing Is All Things—plankton, A Shimmering Phosphorescence

“[…] all things are one thing and that one thing is all things—plankton, a shimmering phosphorescence on the sea and the spinning planets and an expanding universe, all bound together by the elastic string of time.” — Ricketts and Steinbeck, The Log From The Sea Of Cortez

Loading...
End of content
No more pages to load
  • haciendaespanola
    haciendaespanola liked this · 4 years ago
  • aalienbeee
    aalienbeee reblogged this · 5 years ago
  • sammyissassy
    sammyissassy liked this · 5 years ago
  • pgreen37
    pgreen37 reblogged this · 6 years ago
  • sebastianjaymes
    sebastianjaymes liked this · 6 years ago
  • katakulio
    katakulio reblogged this · 6 years ago
  • chezmyki
    chezmyki reblogged this · 6 years ago
  • drrrling
    drrrling liked this · 6 years ago
  • barnie11
    barnie11 reblogged this · 6 years ago
  • st-coyote
    st-coyote liked this · 6 years ago
  • iamluzgar
    iamluzgar reblogged this · 6 years ago
  • philosophicalanthropology
    philosophicalanthropology reblogged this · 6 years ago
  • spongebobslefttoenailfungus
    spongebobslefttoenailfungus liked this · 6 years ago
  • alexalfurinn
    alexalfurinn liked this · 6 years ago
  • thedronesneedyou
    thedronesneedyou reblogged this · 6 years ago
  • silver9mm
    silver9mm reblogged this · 6 years ago
  • rideronapalehorse
    rideronapalehorse reblogged this · 6 years ago
  • masterriku
    masterriku reblogged this · 6 years ago
  • masterriku
    masterriku liked this · 6 years ago
  • thewanderingknight
    thewanderingknight liked this · 6 years ago
  • feral-creatures
    feral-creatures reblogged this · 6 years ago
  • sheloveskitties
    sheloveskitties reblogged this · 6 years ago
  • sheloveskitties
    sheloveskitties liked this · 6 years ago
  • wolf-gang-cobain
    wolf-gang-cobain liked this · 6 years ago
  • lesbian-i-ching
    lesbian-i-ching reblogged this · 6 years ago
  • lesbian-i-ching
    lesbian-i-ching liked this · 6 years ago
  • proudsharkapologist
    proudsharkapologist reblogged this · 6 years ago
  • radio-ramblings
    radio-ramblings liked this · 6 years ago
  • darkmelancholia
    darkmelancholia reblogged this · 6 years ago
  • rideronapalehorse
    rideronapalehorse liked this · 6 years ago
  • couldyoujusttrustmethisonce
    couldyoujusttrustmethisonce reblogged this · 6 years ago
  • roserado
    roserado liked this · 6 years ago
  • thestarninja
    thestarninja liked this · 6 years ago
  • barnsburntdownnow
    barnsburntdownnow liked this · 6 years ago
  • evenlessoriginalurl
    evenlessoriginalurl reblogged this · 6 years ago
  • evenlessoriginalurl
    evenlessoriginalurl liked this · 6 years ago
  • wolvves
    wolvves reblogged this · 6 years ago
  • vpng
    vpng liked this · 6 years ago
  • tupeloshoney
    tupeloshoney liked this · 6 years ago
  • plutorising
    plutorising reblogged this · 6 years ago
  • singingwitch
    singingwitch liked this · 6 years ago
  • solarpunk-gnome
    solarpunk-gnome reblogged this · 6 years ago
in-pursuit-of-knowledge-blog - Everything Is Interesting!
Everything Is Interesting!

Once I was made of stardust. Now I am made of flesh and I can experience our agreed-upon reality and said reality is exciting and beautiful and terrifying and full of interesting things to compile on a blog!   /  27  /  ENTP  /  they-them  /  Divination Wizard  /  B.E.y.O.N.D. department of Research and Development  /  scientist  /  science enthusiast  /  [fantasyd20 character]

162 posts

Explore Tumblr Blog
Search Through Tumblr Tags