|“|| Ms. Baxter: What is it?!
Zack: We don't know! It's not quite a liquid and not quite a solid.
A Sentient Blob was created in a accident during a science class in Jefferson County Middle School.
In The Substitute, while Zack was helping in a demonstration in science class he misheard and realized too late that he was handling a solution of diaminohexane, which makes him sneeze. When he sneezed, he bumped the beaker that he had just pour the diaminohexane into and a small amount of the mixture fell onto the floor. The disinterested demotivated substitute teacher Ms. Baxter told them to pour some chemical absorbent on it. Milo went to fetch it from the closet but was distracted by the time travelers trying to hide in there and accidentally picked up the pistachio tree fertilizer they had brought from the future instead of the chemical absorbent. Upon returning he dumped the fertilizer on the spill and it began to bubble and grow.
The resultant sentient blob soon was large enough to cover most of the floor of the science class and began throwing and tormenting all within the room. In the confusion the time travelers tried to make a break for it but the blob caught Dakota's leg as he reached the door. Eventually Milo had the idea of cooling the blob down with fire extinguishers until it fully transitioned into a solid state. As he enacted his plan, he shut the door, severing the blob section that had Vinnie's leg. In Vinnie's recoil the severed section was flung onto an air vent, through which it escaped. Milo's plan proved effective as fire extinguishers proved to very quickly freeze the blob. Milo's friends, Zack and Melissa quickly joined him and together made short work of the sentient blob.
Meanwhile, in his attempts to save a pistachio plant outside, Cavendish accidently stepped on it after shooing Diogee away before peeing on it. The time travelers then left, having failed their mission. The surviving section of the sentient blob exited the air vents nearby and crossed the yard to the crushed plant. It was then absorbed by the ground around it and the tree seemed to be miraculously healed, though it then held a different color and a section of it was glowing.
The blob takes on the appearance of a transparent light green, very viscus fluid with a volume of at least a car. It appeared to have a smooth surface and could manipulate it's shape into many appendages of various size that often seemed to be roughly based off hands or tentacles, if it is grabbing at something, or more rarely like a foot, when it kicked open the closet door.
It was created by mixing diaminohexane with pistachio tree fertiliser from the future, even though the diaminohexane had presumably at least started becoming part of a polymer as adding it was the last step in the experiment. The diaminohexane may have acted more as a catalyst as only a large drop of the final mixture fell onto the ground which can't have contained more than a hundredth of a gram of diaminohexane, if Zack got the measurement right. This is not discounting the fraction that had already reacted, though this might not have stopped the fertiliser reacting with that fraction. Though there wasn't much fertiliser either, with Milo easily able to carry around the tin. If mass was conserved, this would mean that the Sentient Blob would have a very low density. Obviously, shortly after the reaction occurred the blob gained a level of sentience.
It's unknown if the amount of the reactants were factors in it's size or if it could change it's size at will. Though it's ability to change it's volume is doubtful as the blob seemed to stay roughly the same size after it's initial growth period. The severed blob section also maintained it's size after being severed. If it had a low density it must also have a very large strength to weight ratio as it easily picks up many humans during the encounter, each potentially being ten times as heavy as the entire blob.
The blob appears to be homogenous in it's structure, with no complex organs or specialised sections of its body, apart from it's appendages that seem to be able to form and remerge around any part of it's body. This model would indicate that every part of it's body would take some part in thinking. This is supported by the severed section, which was originally being used as a hand like appendage, being able to think independently from the main body.
It is unknown how the blob senses it's environment. It would most likely be able to sense through touch, but at several moments it enacts actions that indicate it accurately knows the location of objects and people it has never touched. It holds no complex organs that could be dedicated to sensory activity. Seeing, through the detection of light, is unlikely to be its primary sense as it is transparent and any photosensitive chemicals would be effected by light from every direction, only allowing the general level of light in the room to be detected. Even if it could detect a non visible wavelength of light that it's body was opaque to, objects would still be ill defined as the surface would still accept light from half the room, though it would be able to make out some details if it surrounded an object. It therefore has little chance of depicting a mobile phone screen due to its intricate details and that it would mostly use only visible light.
It might be able to detect sound by the vibration across it's surface, and it's size might allow it to know the position of a sound's source, but there are many instances when it attacks someone who is making relatively no noise and it clearly knows where Ms. Baxter is, even though she is making no distinguishable noise. It may use a form of active echolocation at a frequency above human hearing. It's surface may be able to detect chemicals in a similar fashion to smell, if it was sensitive enough it would be able to determine the location of humans using this method. Another possible sense could be a form of electro-location, the ability to detect electric fields produced by muscle or nerve use (A sense that platypuses use extensively when hunting). A version where the lifeform combines this with a strong internally produced electric field can be used to differentiate many substances by their electric conductivity, though this would be harder to understand with such a complex body shape. Both smell and electro-location would allow the blob to differentiate humans from their surrounding easily, which the sentient blob exhibited when it quickly retrieved Dakota and Cavendish from a dark unexplored cluttered closet.
It was shown by Mort that brute force over a relatively large surface area was ineffective at damaging it, proof of it's strength, but that Milo was easily able to slice a section off when he shut the door quickly. The quick recovery of the severed section and it's ability to seep though a grate indicate that it should prove no trouble for a severed section to recombine with the rest of the body. Milo's strategy of freezing it prove very effective as thick sections of the blob completely freeze very quickly under the spray of a fire extinguisher. This outcome would be expected for an object of exceptionally low density, as a low heat capacity would mean it was very susceptible to temperature change. The texture of the frozen blob looks much more jagged than the room temperature blob. The small flat sections that make up it's surface might indicate a macro cell like structure. Though the texture is much more likely to be fracture lines due to the rapid contraction of the blob's substance, unable to maintain it's original shape. This is supported by the final assault where the frozen smooth blob can be seen for a moment before it completely freezes through. Then it formed many fracture lines that it then breaks across. It is assumed and appears to be so that the cold also kills the blob, irreversibly altering the chemical organisation that allows it to achieve large scale organised movement and sentience.
A section of the sentient blob was able to seep into the ground around a mortally injured pistachio tree. It was then able to enter the tree and was able to facilitate rapid healing, as the tree very quickly regains it's normal structure and was able to grow new leaves in seconds. It also somehow transferred its sentience or allowed the tree to develop its own sentience. It also drastically altered how the tree would grow as it eventually developed into a new humanoid shaped species, similarly capable of thought. It's ability to heal and maintain and maybe improve a pistachio tree might be an ability that it could undertake due to it being nearly entirely made up of futuristic pistachio tree fertiliser, though the mixture had obviously been chemically altered to some degree.
It first grew to the point that it could reach any position in the science classroom, though it's growth may not have been voluntarily controlled. It then waved in front of Ms. Baxter, seeming to check if she could see or was alert to the situation. It is unknown if it knew of her status as the teacher of the class.
Overall it appeared to acted aggressively towards most humans it encountered. Initially it physically threw people around, as it did with Chad and Milo and later with Dakota and Cavendish. It also seemed to want to grab everyone it could, picking up or holding onto many in the classroom. In the case of Ms. Baxter and Zack, it was unclear what it wanted to achieve with this. It seemed to toy a bit with Mort and the other student that attempted to physically combat it. When dealing with the other student it took the broom he was using and used it against him in a similar fashion, showing that it could utilise tools. It also wound the pencil sharpener that Joni's hair was caught in and also was seen using a mobile phone. It isn't shown if it was able to achieve anything with the phone or if it was just trying to annoy Amanda.
As a newly created entity, the extent of it's knowledge is unclear. By it's first act of waving a hand like appendage in front of Ms. Baxter, it seems to know something about human physiology, culture or have aspects of human psychology. If it has little knowledge of humans, from an objective point of view, it's actions may be explain by wanting to learn about them and it's environment. It's use of tools and eventually a cell phone seem to indicate rapid learning ability if it had no prior knowledge, though it is more likely it had the skills to operate such tools from the start. This is supported by the fact that it had no opportunity to observe and learn how to use a mobile phone.
Although it could reach the whole room, it seemed to show that it only had enough attention to initiate complex acts in one region at a time, though this may also have been due to physical or sensory inability, or due to it's preference.
Severed sections of the sentient blob could think independently from the body, though it is unverified if the severed section would have a lower thought capacity or different personality. A homogenous structure would lean towards the conclusion that a smaller section of the blob would have a lower thought capacity and no change in behaviour beyond the lessened ability to think and it's new situation as a smaller blob. The severed section that was attacking Vinnie didn't reengage the time travellers after it was severed, which may be due to a sense of self preservation, or instincts or goal change given a new situation.
The severed section eventually made it's way to a dying pistachio tree, where it gave up it's mobile form to strengthen the tree. As it is primarily made up of a mixture engineered to help pistachio trees grow, it's actions might have been controlled by it's intended primary purpose, though it also might have sought a less vulnerable form to ensure survival. Whether through it's own intentions or not, the tree eventually formed a level of sentience that was akin to a human, with a personality and the ability to think strategically developed to the point where it could form and implement complex personal goals, such as taking over the world and comprehending the use of time travel.
It's development into an AI item that wants to take over the world was obviously not the outcome expected from applying fertiliser to a pistachio tree. Although the creation of sentient blobs was well known to the time travellers that brought the fertiliser it obviously wasn't expected for the fertiliser to turn into one before they applied it to the tree. Although it had been changed, the fertiliser did make it to the pistachio tree as intended. Therefore, it's different form, maybe with the input violent nature of it being severed from it's original blob, somehow allowed it to grow uncontrollably and to have violent ambitions against humans.