Opening the window, we hear the noise of objects located in different places, some of which are out of sight. You cannot get rid of the noise, even if the window is slightly open. Due to diffraction, the sound waves bend around the edges of the gap and spread throughout the room.
We hear the voice of a person with his back to us. Thanks to diffraction, sound waves bend around his head and enter our ear.
During a storm at sea, waves excite vibrations on the entire surface of the bay, with which the sea is connected by a narrow strait ..
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.