How to clean a fish tank 101

When I was young, I used to stay at my grandma's house frequently. There is this huge fish tank with my uncle's precious Arowana swimming freely inside. So one day, my uncle ask me to help him clean the tank with him. He told me: "Bring the pipe here, I'm going to show you a magic trick!" I did as he say, and he asked me, "In order to clean the tank, you have to pour out the water inside agree?" "Yes.", "But how to pour out the water when the tank is so heavy?" I stunned. Yea, How? If there were two people push the tank from the side, the tank can be lay down but the glass might break because there is no cushion underneath. But if we lift up the tank and let it be slanted, the water will flow out, but of course not all of them. Just then my uncle said:"Let me show you the MAGIC!"

He put one end of the pipe into the tank and hold the other at a big empty basin. Then, he put his mouth close to the pipe and sucked the air inside it. With the shadow at the pipe, I saw the water flowed magically from the fish tank towards the basin. "WOW!!!" I shouted. "How did you do it uncle?" He smiled and say is the work from the intelligent of our ancestors, you will find out why next time when you learn Physics. "What is Physics?" "Physics is the answer to everything you have ever wonder WHY."  

This is my first ever acquaintance with Physics. Now I know that this is due to Atmospheric pressure that pushed the water out of the pipe. Physics can really help us solve problems daily life simply just applying it. The discovery from the Physicist really helps to develop human kind towards a better quality of life. In fact, everything starts with Physics, just like how this universe are made.