After years of research I (Diji N J) was able to scientifically explain art of levitation of yogis.
Diamagnetic materials can be repelled, (in a non-uniform field Diamagnetic materials are repelled from the region of greater magnetic field) and magnetic materials can be attracted by strong magnetic field.
Neurons in brain can emit electric signals. Electric signal can produce electromagnetic field. Thoughts can stimulate neuron to produce electric signal. Many small electromagnetic fields can be combined to produce large electromagnetic field, by aligning source of EM field. Brain contains billions of neurons. By controlling thoughts, it is possible to synchronously stimulate each neuron in brain such that EM field produced is perfectly aligned to generate a very strong EM field. This magnetic field can be used to attract or repel other objects. This is what is called telekinesis. By using this magnetic field to repel Earth, we can levitate (sand / silica is diamagnetic; non-uniform magnetic field from brain can repel Sand(Earth), there by levitating human body). By combining electromagnetic Cosmetic Therapy (mentioned elsewhere) with this concept, we can change Shape of our body and face by thought. by stimulating body and organ cells by this magnetic field in a controlled way, we can replenish and rejuvenate our body cells and live longer. All these are controlled by our thoughts. So telekinesis, levitation, morphing human body (shape shifting) and live longer; all these techniques mentioned in Hindu mythology as practiced by ancient Hindu gurus (sanyasees) by controlling their thoughts must be true. So all those Hindu mythology could be true. These ancient Hindu gurus control their thoughts by meditation and yoga.
You may wonder that, without the knowledge of advanced science, how ancient Hindu gurus made this possible. But a 2 year old child does not need knowledge of Newton's laws of motion to learn to walk. it's just a natural instinct. so these ancient Hindu gurus should have mastered these techniques by trial and error and by dedication.
What kind of thoughts can generate such an effect, can be found out by carrying out a series of brain simulation on super computer.
Background Theory: The tesla (symbol T) is a unit of measurement of the strength of the magnetic field.
1 Tesla is equal to 1 V.s/m2.
V = voltage (electric potential)
s = second (time)
m = meter (distance)
A Diamagnetic material can be levitated in a magnetic field of about 16 Tesla. Magnetic materials can be attracted by much less magnetic field.
Neuronal firing is argued to be sensitive to the variation of as little as one millivolt .
The average human brain has about 100 billion neurons (or nerve cells) and many more neuroglia (or glial cells) which serve to support and protect the neurons (although see the end of this page for more information on glial cells).
One hypothesis is that magnetic fields in the 0.5-9 Tesla range can affect the ion permeability of neural membrane..