The session that held on 02nd of August. Firstly we shared our experiences in last week. Today we learnt about Doppler effect. The Doppler effect meaning is the change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the Wave. Everything is made out of air, water, soil ,sunlight and space.They are made out of atoms Atoms are made out of electrons, protons and neutrons, The electron is a brake, Proton is a axerlater and neutron is a driver. They are made out of vibration. As an example the ambulance siren connect to the air. The air get vibration and it connect to the ear. then the ear get vibration and it connect to the brain. then the brain get vibration and it said the information to us.