The biggest interrogation about aliens is n’t whether they ’ll sweep over us with their superior technology , and subdue the human population . The with child question is : Why ? What could they maybe need from us that they ca n’t get anywhere else ? Most of the resources on Earth are available in space , where they ’re easier to get at , without any nettlesome gravitational force well . But the biggest imagination that aliens believably could n’t see anywhere but on Earth is … us .
Here are 10 parts of your body that aliens might find it worthwhile to come to Earth and loot .
Top paradigm : Milla Jovovich in The Fourth Kind .

This tops this leaning because , honestly , allow ’s desire they ’re after us for our hair . It ’s renewable , it ask a certain level of health to be at its best timbre — and we do n’t die when it ’s reap . permit ’s take a look at the facts . Most people agree that mammal were one comet timid of never getting big at all . Who said that anything like us has to exist on other satellite ? Anyone see any hair on ET , or the brute from Signs ? Your hair keeps forever , but can be reuse to offer amino acids for food like soya sauce and pizza wampum . Hair soak up petroleum at a phenomenal charge per unit . It can be woven together as durable cloth , or placed on farm land as particular fertilizer . It even has specialoptical property . We could be conquered by terrifying aliens and go away expect the worst — only to be shorn like sheep every year .
This one is slightly less pleasant than hair because we might have to come along with the nincompoop . That would not be a pleasant experience . It ’s also a long shot . Most species produce their own excrement , and do n’t need to harvest that of other coinage , but it ’s possible that the aliens take in and let loose a serial publication of petrol , and if that ’s the case , they might need someone else ’s poop . Why ? Space is full of high - vim radiation that tear through metallic element . The content of a space ship can be shielded by a high electromagnetic field , but that raise other major problems . layer and layers of dense constitutive cloth , on the other hand , absorb a mint of that radiation .
Present - twenty-four hours infinite agencies already have look at the idea that astronauts on long - haul voyage could line the walls of their spaceship with their intellectual nourishment on the way to wherever they ’re go , and line the walls with their poop ( properly box , of course of instruction ) on the way of life back . Such agency also refer that it could , with enough work , be potential to process that poop until it become comestible again . It ’s then possible to feed those processed patty to the astronauts , who will then poop them out , and then it ’s back to the rampart . I consider at this dot it ’s gentle to see why we would rather have the aliens take our hair .

When you journey through space , you want to keep your energy down and you want to keep your profile up . You have to do both of these with fabric that ’s either ego - repairing or extremely elusive . Tooth enamel is the latter . Why would it help any creatures that are blow through the Galax urceolata ? Because it glows a bright fluorescent green under ultraviolet lighting . I ’m not saying that it ’s the most crucial thing in an alien ’s ship . However , marking out instruments with tooth enamel will be an easy way to read when traversing the skies . So do n’t be surprised when aliens show up and begin pulling out your teeth , and then give you toothless but alive .
There ’s no guarantee that living on other satellite will be that different from lifespan on Earth . There are theories thatlife on this major planet emerged from microbial lifespan that came here as debris from other planet . That mean that we could , grow from the same building blocks and perhaps disclose to similar conditions , have certain things in common . On this planet we harvest things like hormones for birth control from other creature . peradventure someday aliens will find that our human hormones prevent them from release their nut into their hereditary spawning H2O . Or that , when they latch on to the heads of other creatures and joint tentacles down their throats , they only inject them with a sponger if they feel quick to make a commitment .
https://gizmodo.com/could-aliens-have-created-life-on-earth-5918189

We , as a species , have plenty . And no matter what anyone thinks of it on us , it ’s an get-up-and-go source . Perhaps their ship are biological . There is one Earthling who uses it torun his cars . Perhaps , again , the extraterrestrial have a biologic make - up close to ours and our fat is the in effect to use in their cosmetics ( species have been wiped out for less ) . Maybe it just makes us taste good . Whatever the grounds , you could find yourself getting slimmed down in an unpleasant way .
await , reckon if you had some useful machines . And you saw that , in those useful machine were percentage that would make massive quantities of new useful machines , would n’t you stock up on those parts before you go home ?
But waitress , you ’re saying . There ’s scads of water on Earth , easy to pick up everywhere . But if you come over from Mars and your one cerebration is to keep your dying satellite , are you break down back without every drop of H2O you could squeeze out of your pesky blue neighbour ? No ! Humans are up to sixty percent body of water , and there are seven billion of us . And we ’re very portable . After they suck up all the water from the ocean and rivers and meth caps and the plants , they very well might go ahead and wring out masses like sponge . There is , however , a experimental condition on this . The universe of discourse actually has a lot of weewee , but the largest quantities of it tend to be far away , out of the solar system . Only planets within our own solar organization would see this kind of thing as worthwhile . So if it turns out there are n’t any ripe Martians or Venusians , we ’re off the claw for this one !

Our cells are , mostly , subject to the Hayflick Limit , which sets a crown on how many time that cells can multiply . This cruelly limited jail cell biologists , until they stumble on to Crab cells from Henrietta Lacks . Her cells ( call HeLa cells ) kept part and dividing , induce them perfect for use in experiment . Since then , scientist have ascertain ways to induce immortality in cell lines — for humans . Aliens might not be subject to the same variety of limits that human cells are . There may be no way to cause that sort of immortality , or they may not have get word the difference between immortal and mortal cadre at all . In this sheath , these cell might serve the purpose that point animal cell did before HeLa cells were found . Even if they bang perfectly well what will function for them , there ’s a ground why HeLa and other immortal cell melodic phrase are in testing ground the world over . They are vital to biologic research , and so they ’d be full of life to any species that wanted human biologic creature .
Who get laid what kind of things will come over to Earth through the devoid wasteland of space ? It ’s probable that if they ’re mechanically clever they manage to make it to Earth , but then again , who knows what they ’ve transcended so as to make the journey . The human hired man , however , has make do to paint masterpieces , done the lifting that built cathedrals , and cautiously put together political machine that , in turn , put together even more simple machine . It ’s an astonishingly good mechanically skillful physical object , and though it takes some time to get the hang of , it has a tractableness , dexterity , and military capability . Go in the lead and try not to think of alien ships , or house , lined with helpful human arm .
Oh , like I was going to pick anything else for figure one ? There are a fate of good teeth out there . There ’s a lot of fat and shite and hair in the fauna realm . But the human brain is , not to be too speciesist about it , the state of the art brain on planet Earth . capable to maintain long - term networks . Able to adapt them when they ’re destroy . Able to make fresh cells , to sharpen and learn from almost anything . And with a capacity for symoblic and lingual idea that is n’t meet anywhere else in the animal kingdom , this is the stuff correctly here . We talk a draw about breeding data processor to learn , or think , like brains . What if the alien that finally make it to Earth have given that up and taught brains to ferment like computers ? If that was the case , each new genius they pick up throughout the universe , is the equivalent of picking up whole new parts with new role and unexampled specializations . Since the human brain has a lot of unique feature , but it also adaptable to new situations with a little training , if the alien are pass to focalise on humans at all , they ’ll focalise on us for us brains . Human minds might journey the universe more extensively as part of alien space ships than in our own bodies .

All affair view , though , I ’d opt it if they just came for hair .
Teeth Image : David Shankbone
Water Image : Sven Hoppe

ViaThe Beauty Brains , eHow , NCBI , NY Times , andDiscover .
AliensBiologyScience
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