biologic liquid weapon

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Imagine human like creatures with glands inside their forearms that can quickly produce a liquid that when exposed to air turns to a solid has hard as bone.



The liquid can be used to create and throw projectiles out of the forearm or to create a blade attached to the underside of the wrist.



How could this evolve and why?










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    I don't think shapeshifters applies here. I replaced it with natural-weapons, which seems more appropriate given the question. Other tags may also apply.
    – Î± CVn♦
    28 mins ago














up vote
4
down vote

favorite












Imagine human like creatures with glands inside their forearms that can quickly produce a liquid that when exposed to air turns to a solid has hard as bone.



The liquid can be used to create and throw projectiles out of the forearm or to create a blade attached to the underside of the wrist.



How could this evolve and why?










share|improve this question









New contributor




Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.















  • 1




    I don't think shapeshifters applies here. I replaced it with natural-weapons, which seems more appropriate given the question. Other tags may also apply.
    – Î± CVn♦
    28 mins ago












up vote
4
down vote

favorite









up vote
4
down vote

favorite











Imagine human like creatures with glands inside their forearms that can quickly produce a liquid that when exposed to air turns to a solid has hard as bone.



The liquid can be used to create and throw projectiles out of the forearm or to create a blade attached to the underside of the wrist.



How could this evolve and why?










share|improve this question









New contributor




Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











Imagine human like creatures with glands inside their forearms that can quickly produce a liquid that when exposed to air turns to a solid has hard as bone.



The liquid can be used to create and throw projectiles out of the forearm or to create a blade attached to the underside of the wrist.



How could this evolve and why?







biology creature-design natural-weapons






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Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 28 mins ago









α CVn♦

21.3k1087166




21.3k1087166






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asked 55 mins ago









Eries

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436




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Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Eries is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







  • 1




    I don't think shapeshifters applies here. I replaced it with natural-weapons, which seems more appropriate given the question. Other tags may also apply.
    – Î± CVn♦
    28 mins ago












  • 1




    I don't think shapeshifters applies here. I replaced it with natural-weapons, which seems more appropriate given the question. Other tags may also apply.
    – Î± CVn♦
    28 mins ago







1




1




I don't think shapeshifters applies here. I replaced it with natural-weapons, which seems more appropriate given the question. Other tags may also apply.
– Î± CVn♦
28 mins ago




I don't think shapeshifters applies here. I replaced it with natural-weapons, which seems more appropriate given the question. Other tags may also apply.
– Î± CVn♦
28 mins ago










2 Answers
2






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up vote
2
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It couldn't.



Anything that hardens that fast will have a soft interior because the inside has not been exposed to air long enough to harden. You need either slow extrusion, with each thin layer forming on top of the earlier ones, like coats of paint; or thin fibres that bind together to form a single structure, i.e., a horn. Neither one is an instantaneous process, so Wolverine claws are right out.






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    up vote
    2
    down vote













    It won't.



    We do have liquid suspensions that solidify when they get out of the bloodstream or our glands: platelets become blood clots, gunk is left over when tears dry etc. But those are not very dense.



    For a claw or projectile to be made, it would be as dense as the liquid it came from if it kept the same volume. In other words, for the volume of a 9mm bullet (a little less than 0.18cm3), you'd spend that much fluid to make a bullet as dense as the fluid itself. For the record, human blood is marginally more dense than water.



    Every time you double the amount of liquid for the dame volume (compressing the liquid), you double density
    To achieve the density of human bone ([1.75g/cm3), you'd need to spend just a little more blood per bullet.



    How effective would that be? Get a t-bone bone (I know it sounds silly, but I can't find another name for it), break it into bullet sized pieces and toss at a friend. For science. Now imagine a creature bleeding in order to do that. In the very least natural selection would penalize creatured who used this "weapon" to hunt, or to fend off predators. If you are willing to stretch the bow past the point where it breaks, such bone bullets could be used in sexual courtship, but that's it.






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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes








      up vote
      2
      down vote













      It couldn't.



      Anything that hardens that fast will have a soft interior because the inside has not been exposed to air long enough to harden. You need either slow extrusion, with each thin layer forming on top of the earlier ones, like coats of paint; or thin fibres that bind together to form a single structure, i.e., a horn. Neither one is an instantaneous process, so Wolverine claws are right out.






      share|improve this answer
























        up vote
        2
        down vote













        It couldn't.



        Anything that hardens that fast will have a soft interior because the inside has not been exposed to air long enough to harden. You need either slow extrusion, with each thin layer forming on top of the earlier ones, like coats of paint; or thin fibres that bind together to form a single structure, i.e., a horn. Neither one is an instantaneous process, so Wolverine claws are right out.






        share|improve this answer






















          up vote
          2
          down vote










          up vote
          2
          down vote









          It couldn't.



          Anything that hardens that fast will have a soft interior because the inside has not been exposed to air long enough to harden. You need either slow extrusion, with each thin layer forming on top of the earlier ones, like coats of paint; or thin fibres that bind together to form a single structure, i.e., a horn. Neither one is an instantaneous process, so Wolverine claws are right out.






          share|improve this answer












          It couldn't.



          Anything that hardens that fast will have a soft interior because the inside has not been exposed to air long enough to harden. You need either slow extrusion, with each thin layer forming on top of the earlier ones, like coats of paint; or thin fibres that bind together to form a single structure, i.e., a horn. Neither one is an instantaneous process, so Wolverine claws are right out.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 24 mins ago









          nzaman

          7,89211340




          7,89211340




















              up vote
              2
              down vote













              It won't.



              We do have liquid suspensions that solidify when they get out of the bloodstream or our glands: platelets become blood clots, gunk is left over when tears dry etc. But those are not very dense.



              For a claw or projectile to be made, it would be as dense as the liquid it came from if it kept the same volume. In other words, for the volume of a 9mm bullet (a little less than 0.18cm3), you'd spend that much fluid to make a bullet as dense as the fluid itself. For the record, human blood is marginally more dense than water.



              Every time you double the amount of liquid for the dame volume (compressing the liquid), you double density
              To achieve the density of human bone ([1.75g/cm3), you'd need to spend just a little more blood per bullet.



              How effective would that be? Get a t-bone bone (I know it sounds silly, but I can't find another name for it), break it into bullet sized pieces and toss at a friend. For science. Now imagine a creature bleeding in order to do that. In the very least natural selection would penalize creatured who used this "weapon" to hunt, or to fend off predators. If you are willing to stretch the bow past the point where it breaks, such bone bullets could be used in sexual courtship, but that's it.






              share|improve this answer
























                up vote
                2
                down vote













                It won't.



                We do have liquid suspensions that solidify when they get out of the bloodstream or our glands: platelets become blood clots, gunk is left over when tears dry etc. But those are not very dense.



                For a claw or projectile to be made, it would be as dense as the liquid it came from if it kept the same volume. In other words, for the volume of a 9mm bullet (a little less than 0.18cm3), you'd spend that much fluid to make a bullet as dense as the fluid itself. For the record, human blood is marginally more dense than water.



                Every time you double the amount of liquid for the dame volume (compressing the liquid), you double density
                To achieve the density of human bone ([1.75g/cm3), you'd need to spend just a little more blood per bullet.



                How effective would that be? Get a t-bone bone (I know it sounds silly, but I can't find another name for it), break it into bullet sized pieces and toss at a friend. For science. Now imagine a creature bleeding in order to do that. In the very least natural selection would penalize creatured who used this "weapon" to hunt, or to fend off predators. If you are willing to stretch the bow past the point where it breaks, such bone bullets could be used in sexual courtship, but that's it.






                share|improve this answer






















                  up vote
                  2
                  down vote










                  up vote
                  2
                  down vote









                  It won't.



                  We do have liquid suspensions that solidify when they get out of the bloodstream or our glands: platelets become blood clots, gunk is left over when tears dry etc. But those are not very dense.



                  For a claw or projectile to be made, it would be as dense as the liquid it came from if it kept the same volume. In other words, for the volume of a 9mm bullet (a little less than 0.18cm3), you'd spend that much fluid to make a bullet as dense as the fluid itself. For the record, human blood is marginally more dense than water.



                  Every time you double the amount of liquid for the dame volume (compressing the liquid), you double density
                  To achieve the density of human bone ([1.75g/cm3), you'd need to spend just a little more blood per bullet.



                  How effective would that be? Get a t-bone bone (I know it sounds silly, but I can't find another name for it), break it into bullet sized pieces and toss at a friend. For science. Now imagine a creature bleeding in order to do that. In the very least natural selection would penalize creatured who used this "weapon" to hunt, or to fend off predators. If you are willing to stretch the bow past the point where it breaks, such bone bullets could be used in sexual courtship, but that's it.






                  share|improve this answer












                  It won't.



                  We do have liquid suspensions that solidify when they get out of the bloodstream or our glands: platelets become blood clots, gunk is left over when tears dry etc. But those are not very dense.



                  For a claw or projectile to be made, it would be as dense as the liquid it came from if it kept the same volume. In other words, for the volume of a 9mm bullet (a little less than 0.18cm3), you'd spend that much fluid to make a bullet as dense as the fluid itself. For the record, human blood is marginally more dense than water.



                  Every time you double the amount of liquid for the dame volume (compressing the liquid), you double density
                  To achieve the density of human bone ([1.75g/cm3), you'd need to spend just a little more blood per bullet.



                  How effective would that be? Get a t-bone bone (I know it sounds silly, but I can't find another name for it), break it into bullet sized pieces and toss at a friend. For science. Now imagine a creature bleeding in order to do that. In the very least natural selection would penalize creatured who used this "weapon" to hunt, or to fend off predators. If you are willing to stretch the bow past the point where it breaks, such bone bullets could be used in sexual courtship, but that's it.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 15 mins ago









                  Renan

                  36.8k1184188




                  36.8k1184188




















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