Links: Alien bacteria found (not really)

The bacteria was found at this lake.  (Beautiful pic) (NASA)

So I am a few days late on this.  On Thursday, NASA announced that they discovered a new type of bacteria that makes us reexamine the conditions necessary for life to exist.  The discovery was a bacteria that can use arsenic instead of phosphorus in it's DNA.  Here is a link to the NASA release. 

So what.  Well, the DNA, which contains the blueprint for an organism to grow, of all previously known life on Earth is made up of only six elements, Carbon, Hydrogen, Oxygen, Nitrogen, Sulfur, and Phosphorus.  When astronomers search for lift on other planets, moons, or around other stars, they look for conditions that match what we think life needs to survive.  The bacteria NASA discovered reportedly can substitute Arsenic for Phosphorus in it's DNA.  Arsenic is highly toxic to most life on Earth.  Previously, organisms have been discovered which can survive high levels of Arsenic, but this is the first claim of one using it to build it's cells.  If true, it means it is possible for life to exist with a different set of conditions than we had thought.  Very important for those searching the galaxy for life, because not only can the be open to locations with high levels of arsenic, but they have some evidence that even more combinations of elements could lead to life.  This is really exciting for scientists and science-fiction readers/writers, who for years have hypothesized that there might be life out there built on different block than we are.  We now have some evidence that is it possible.  Maybe.

While the news is very exciting, a few places on the internet have gone a little overboard.  First, the claims of the bacteria actually using the Arsenic in their DNA is not quite confirmed yet, it is just the most likely hypothesis as of now.  It absorbs Arsenic and grows in it's presence, but many more tests are needed to confirm that it actually uses it in DNA, and how it does it.   Nature has a good review. 

Second, there is no evidence that this bacteria is alien in origin.  At least not any more evidence than all life on Earth came from outer space.  See panspermia for more information.

Likewise, third, this is not evidence that life evolved more than once on Earth independently.  This bacteria is probably a mutated form of other previously existing bacteria species, but this has not been proven either way.  The lake where it was found was connected other water sources just 10's of millions of years ago, it has not been isolated since like began to develop billions of years ago.

Finally, I do think there is one other implication here that seems to be missing from some discussions.  If we have been studying life on Earth and evolution for hundreds of years, and just now found something that may cause us to modify our definition of what is necessary for life, what does it say about our efforts to find life in other places.  With it so much more difficult to make observations on Mars, around Jupiter, Venus, or any other planet, who knows what exists that we have just not come across yet.  Just because we didn't find life in our first observations on Mars, we can't be sure we have ruled out life being somewhere on that planet.

Here are a couple of the stories explaining the news.


Yahoo News
Mercury News
Popular Science

Links: Plants Send for Help and Changing El Ninos

Tobacco Hornworm Caterpillar (A. Williams)

To start off today, we have a cool story that outlines one example of an evolutionary arms race. We usually see examples of predator/prey races, but it occurs in herbivore/plant interactions as well! Tobacco plants calling predatory insects to their aid when being eaten by caterpillars? If that isn't an extremely cool instance to evolutionary warfare, I don't know what is!

Plants send SOS signal to insects.


One of the worrisome unknowns about climate change is the effect on the Earth's oceans. We've been able to predict what we think might happen, rising sea levels, changes in currents and temperatures, etc., but until it happens, it's hard to tell what will actually occur. Well, it's happening, so the data is starting to come in. NASA (National Aeronautics and Space Administration) and NOAA (National Oceanic and Atmospheric Administration) have teamed up to study the effect of climate change on El Ninos. The findings show effects, of course, but what these effects mean for those that are influenced by the phenomenon aren't known yet.

El Ninos are growing stronger, NASA/NOAA study finds.

Links: More Space, More Zombies, More Science

Braaaains!  (Arthur Chapman)

While I'm on the topic of zombies, here is some information on another type, ant-zombies. Some of you might know about parasite fungi that infect ants and manipulate their brain, causing the ant to die in a way that benefits the fungi. New fossil evidence shows that this behavior has been going on for tens of millions of years.

Science Daily: Fossil Reveals 48-Million-Year History of Zombie Ants

Next up is something that is probably cooler to me that the average nerd. I watched some Star Trek when I was a kid. If you did too, you remember the ship had these things called "Replicators" - devices which a person could ask for any type of food, and the food would appear out of thin air. As someone who has always liked technology and always like eating, I thought that having one of those would be the coolest thing, no cooking, no needing the right ingredients, just ask for something to eat and it appears. Kids always dream of having some magical toy. Some want a pet dinosaur, some want a big robot, some want a jetpack, I wanted a replicator. OK, and a jetpack. Anyway, it appears I am not alone, as a few scientists and inventors are applying 3-D printing to food. This article is about one design in the concept stages (the pictures are computer generated, this thing has not been built yet).

PhysOrg: Introducing Cornucopia, The Food Printer

Finally, because I am a sucker for pretty pictures from space, here is a best-of-this-summer gallery from the Cassini space probe orbiting Saturn that Wired collected. Enjoy.

Wired: The Summer's Sexiest Images From Saturn

Links: Crazy Bus, Regeneration, and the Beauty of Alaska

Engineers in China have come up with a pretty elegant solution to the problem of overcrowded streets and buses stuck in traffic. They put the bus on stilts and it just drives over the other traffic while only taking up a tiny strip of road on either side.

China Hush: Straddling Bus


Possibly the holy grail of medical technology is human regeneration. It's the idea that we might coax the human body into growing back a lost limb or heart tissues that has led to all kinds of research. Healing cuts in your skin and broken bones are minor forms of regeneration that happen naturally, but, unlike simpler animals like amphibians, we can't regenerate larger parts of our body, probably because evolution forced us to trade long life and cancer resistance for wildly growing cells that can rebuild parts from nothing. This week plenty of news came out related to regeneration research. Here are a few stories. We are still a long way from regenerating a lost limb, but scientists are working on it.

NY Times: Two New Paths to the Dream – Regeneration

BBC News: Surgeons Rebuild Windpipe with Stem Cells

Nature: Skin Cells Converted to Heart Cells (more technical)

Jim Harris Photography

Last today, an incredible photo-essay of a backpacking trip through Alaskan mountains and glaciers. If you are one for beautiful nature pictures, you probably won't be able to stop scrolling down the page. The picture on the right is just one of many.

33 Days Across Wrangell-St. Elias NP, Alaska: The Southern Spiral


Also, this.

Links: Composting Plastics, Venomous Octopuses, and Serenading Sharks.

Here's another link post, so you don't have to read my silly writings!


Our first link is about biodegradable plastics, the development of which has been going on for several years and there have been some results. These "plastics" are actually made from plant material, such as corn starch or tree-produced sugars, and degrade in a compost environment in 6 months time. I wonder when we'll be seeing these plastics in our grocer.

Compostable Plastics have a Sweet Ending @ ScienceDaily.com

World Centric: Bioplastics, a producer of these decomposable plastics. 

Great White Shark

Second is a quite silly continuation of our Ode to Discovery's Shark Week, a man serenading Great White Sharks. He was actually in the water with the sharks and guitar, but I'm guessing they dubbed over the music :).

Seriously, the video's pretty funny.


And our final link also takes place in the ocean, but deals with something with a little less of a backbone. It wasn't until recently that scientists discovered that all octopi, not just the Blue-ringed Octopus, are actually venomous. A study into Antarctic octopi discovered four new species of octopus and two completely new toxins that these octopus carry.

Scientists Tap Into Antarctic Octopus Venom

Links: Smart Tortoises, Distant Planets, AIDS Research

Once a week, eventually every Saturday, we will find a few news stories so you can learn about the newest in science from the source without having to deal with our writing. Well… much of it.

First up, is one of the blogs from scienceblogs.com, which inspired some of what we are doing. It is a long read, but if you wonder how tortoises learn, it's worth a look.

The Thoughtful Animal at Scienceblogs.com

Next is something extra interesting for me. I have been keeping an eye on the Kepler Mission since it launched a year and a half ago. It is a telescope used to look for planets around other stars. Way back in high school I wrote my senior thesis on finding extraterrestrial life. I think I will use a post to write about that topic pretty soon. The Kepler Mission is the biggest leap in that area in 30 years, so I have been waiting for the results. The first batch of data was collected in January, and was scheduled to be made public next January, but apparently someone couldn't wait and "leaked" some of the results during a talk in the UK. They are very interesting and look like the first step in proving what astronomers have suspected for years. Planets like Earth may be very common in the galaxy.

Discovery News: Kepler Scientist: "Galaxy is rich in Earth-like planets"

Finally, quite a bit of news on AIDS research in the past couple days. The first link looks like an early step to a breakthrough, but is still some time off. The second link is something more immediate, but the article is largely focused on the controversial aspects. Take a look.

Singularity Hub: Antibody Neutralizes 91% of HIV Strains  
New York Times: Advance in AIDS Raises Questions as Well as Joy