What I find more interesting is why stars rarely collide? Is it just because all of the stars that were likely collide already have? Or is there some kind of polarity effect whereby most stars share a similar polarity, while non-reactive planets and gases are oppositely charged?
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I'm sure someone will correct me:
I believe A123 had an exclusive with GM/Chevrolet for some time that precluded them from selling to competitors, or to the public. The enthusiast community in the US (electric car, bike, etc kits) then had to rely on re-importing A123 batteries from China/black market that had potentially been exported from the US into the grey market. This made them tough to get, but they had an ideal form factor, power density and draw rate.
If this play by Apple can change that scenario at all, it would be a big move.
A full 66% of our genes are shared with corn (Maize). Those genes are probably the "winners" in terms of evolution of species to date because they played some part in the evolution of a number of relatively successful species and from a selfish perspective eventually lead to our existence today.
Playing audience to a snapshot in time of a species in action is then to witness a battle of relatively new and up-and-coming genes in a highly dramatic and chaotic environment. Some of those new genes may eventually nullify any advantage or even cause attacks on part of that 66%, reducing its relevance further over millennia, and some may allow that species to adapt and further split into new species.
The survival of a species or its ability to procreate is not the end game, but instead one of many potential moves a gene can (randomly?) make to further its ultimate cause. If we refer to those 66% of genes simply as "corn," then who is to say that the remaining 33% of our genes aren't primarily dedicated to simply increasing the population of the "corn" gene pool as a whole, regardless of which species those genes currently reside within? The species has always been a temporary home -- more so a vehicle to navigate environments that are extremely dynamic over a great period of time -- again, time being our naive perspective.
Genes that have been around for a billion years have little concern for the extravagant mutations that allow that vehicle to navigate day-to-day, and if that vehicle fails, they have a million other variants working on their own story. If "corn" has been around for a billion years, then the rest of us is just a short-lived experiment, and perhaps one way to prove ourselves a worthy successor is to bring "corn" with us to the stars in as many ways as possible.
Except that genes are undoubtedly not the sole cause and predictor of behavior. So...
Your AC gene is showing.
To be fair, it's not "people", it's just that one guy.
Sure about that?
The avatar and background image for @CENTCOM was overtaken with the words “CyberCaliphate” and “I love you ISIS,” and the account put out a number of threatening tweets to U.S. military members... U.S. Central Command’s YouTube account was overtaken with the same pro-Islamic State avatar and several videos.
The hacker is claiming to be ISIS — and claimg to have personal information of U.S. military personnel.
There seems to be a lot of confusion and conjecture in the comments about the grandiosity of the claim. This does not necessarily rule out all comets. Maybe an attempt at a better summary of the article would be helpful:
- Not all water is the same. Some water is heavier due to a presence of a certain amount of deuterium.
The general consensus is:
- When the solar system formed, the components for water were created.
- These components eventually formed with the early Earth and a water cycle was created.
- Yes, the early Earth was hot, but heat and elements were plentiful and Earth managed to hold onto some of these elements and would have had water evaporating and raining back down again.
- The planet Theia *collided* into the Earth. A certain amount of the debris coalesced into the moon. Imagine Pluto smashing into your house.
- The heat from the collision would have evaporated/released all elements lighter than X, which includes water. (ed: perhaps water on the moon is more closely related to early earth water coalesced and re-condensed?)
- Sometime later, the Earth received much more water than would have been sustained from such an impact.
- The weight (deuterium ppm) of this "new" water is different (much lighter) than the weight of "old" water, and generally any other water in the solar system.
So where did this "new" water come from?
This article suggests:
"We have light water in some comets and very heavy water in other comets. We have to assume the mixture of all these comets is something that is heavier than what we have on Earth, so this probably rules out Kuiper Belt comets as the source of terrestrial water."
And I believe this means:
It would have taken many of these Kuiper Belt comets to contribute a great deal of water to the Earth. If we use probe measurements to confirm other measurements and calculate the *average* weight of water on a number of Kuiper Belt comets (along the order of magnitude necessary be a main source of "new" water for the Earth), then we see that the amount of deuterium in Earth's water would have been much greater -- i.e. the water would contain an average weight of all impacts needed to saturate.
Thus this rules out Kuiper Belt comets being the main source of "new" water for Earth. Their water in general is simply too heavy on average. As soon as enough Kuiper Belt comets impact the Earth to come close to the amount of water needed, the calculations show that the level of deuterium would be much, much higher than what we see.
And the article itself turns to conjecture with:
So where do we look for lighter water? Maybe asteroids?
Apparently Ben Noordhuis does.
To be fair, the mechanics of the two things can be very similar.
XKCD seems to be pretty spot on here.