[QUOTE=AmirMourad;59971]Surya,
“One is equally foolish to mistake mythology for technical descriptions in Yoga texts which mention clearly that hunger and thrist can be ended if one practices a certain yoga technique.”
But if you consider something like “flying in the sky”, then you are simply being idiotic in the same way that a Christian is being idiotic by actually believing that there was a Tree of Knowledge and Tree of Life in the Garden of Eden.
Those same technical descriptions which describe techniques for arresting hunger and thrist, also give techniques for flying
So why is one real and the other mythology if they occur in the same text?
You pick and choose simply based on what you like or dislike.
“There exists plenty of accounts of yogis throughut yoga lore who have demonstrated these abilities.”
Stories are just stories
Although you sure are fond of citing stories of Buddha aren’t you
So why are those stories true and the ones describing siddhis false.
Again pick and choose on what you like or dislike.
"Levitation has been elevated from being pure science fiction to science fact, according to a study reported today by physicists. "
and it is not in the intention of nature that the human body should levitate or have the potential to levitate, just as it is not in the nature of the human body to fly in the air. Try as one may - you are never going to grow wings, regardless of even infinite siddhis that one may awaken.
But arresting food and hunger is in the nature of the human body
You pick and choose what you like and dislike.
If the mind can control matter on one level it can control them on all levels. Right now, via my mind I am controlling my limbs. I can even regulate my breath. By applying yogic techniques my mind can control my body temperature, heart beat, body temperature, which were previously outside of my control.
The above links shows that levitation is caused to happen by generating a quantum force from the zero point energy field at the fundamental level of matter which can generate an upwards force pusing an object up. Well, guess what the human body is matter and thus it also has a zero point energy field at the fundamental level and thus it can also generate an upwards pushing quantum force.
You cannot produce one reason why mind should not be able to control matter at the fundamental level - you simply state it based on your prejudice on what sounds possible to you and what sounds impossible to you because on your belief you are awakened Buddha. Just because you don’t have these abilities, you conclude that they are impossible 
Interesting eh, going into the zero point energy field and generating an upwards force to push - sounds very similar to Patanjali:
3.40 By the mastery over udana, the upward flowing prana vayu, there is a cessation of contact with mud, water, thorns, and other such objects, and there ensues the rising or levitation of the body.
(udana jayat jala panka kantaka adisu asangah utkrantih cha)
udana = one of the five prana vayus (upward flow of prana in the body)
jaya = by mastery
jala = water
panka = mud, as in a swamp
kantaka = thorn
adisu = and with others, et cetera
asangah = no contact, no adhesion, cessation of contact
utkrantih = rising, ascension, levitation
cha = and
Rising or levitation: By the mastery over udana vayu there ensues the rising or levitation of the body.
Pranas flow in the akasha as subtle currents - yep zero point energy field.
Yes, they have already been invented and put to use. And their use depends on external technology. The human body cannot become invisible, although it is possible to awaken a state of consciousness where it will make you less visible to others in their experience.
Interestingly, the physics behind how the invisibility cloak works is also a dead ringer for Patanjali:
When samyama is done on the form of one’s own physical body, the illumination or visual characteristic of the body is suspended, and is thus invisible to other people.
(kaya rupa samyama tat grahya shakti tat stambhe chaksuh prakasha asamprayoga antardhanam)
kaya = body
rupa = form
samyama = dharana (concentration), dhyana (meditation), and samadhi taken together (3.4)
tat = that
grahya = can be perceived, capable of receiving
shakti = power, capacity
tat = that
stambhe = to be checked, suspended
chaksuh = of the eye
prakasha = light, illumination, visual characteristic
asamprayoga = there being no contact, disconnected, separated contact
antardhanam = invisibility, disappearance

Look, you are wrong. These siddhis in fact do exist and Patanjali actually gives the correct physics too. The truth is Amir, you are nowhere near enlightenment and this is why you have not found these siddhis
It requires consciousness so powerful it can penetrate into the quantum field.