Human is a predictable bio-machine.
The extent of the unpredictable nature of human being arises from the large number of input vectors for which there exist a potentially very large number of outcomes. Confined by the finite thinking, these 'large' and 'very large number' sometime fall outside the boundary of human imagination - hence we term them unbounded and ultimately, unpredictable. For a single molecule submerged in a known chemical solution has and will always react the same way to a certain input excitation. The deterministic natures of a single molecule's response is unfortunately nonlinear in nature and hence cannot be ported linearly to multiple molecules. Place two molecules side by side in the same solution and give the same excitation and the outcome may be different than the single molecule case as the molecule now can react to each others' presence as well as to the input excitation. The deterministic nature apparently fades away as the number of interacting elements increases and as the number of input excitation increases.
For higher primates, the body is made up of vast number of cells and in addition, to make matters far more interesting, it is always submerged with an environment that is constantly feeding excitation through different sensory receptors. factoring in all these values, the number of outcome a biological body can take is simply 'too large' to compute. Hence we remain 'unpredictable'. But the fact is the machine itself is predictable having built from predictable elements. Unfortunately until the point we take significant leap in understanding the numbers of possible outcomes given a set of input excitation, it will be hard to make the very human believe that, within itself, it is nothing but a merely predictable bio-machine. Oct/2016