Science behind Reiki
Reiki is based on Energy Centres inside body, which are also known as Chakras. There are seven chakras in the body. Science approves the presence of these chakras though they are not physical. From top to bottom,
The Crown Chakra receives cosmic energy from surrounding atmosphere and passes it to the Third Eye Chakra, which passes it to Throat Chakra. From there, the energy is passed to the Heart Chakra, which pumps and spread the energy in the whole body including hands.