Science exists not only in thelaboratory but also in our lives. Some common things 29around us can work like a magic. 30 , by putting atangerine into some warm water around 40°C,you can make it taste much sweeter than it 31 . Anotherinteresting thing is a banana peel. When your shoes look 32 ,rub the shoes with the inside of a banana peel.The tannin in the peel works like magic, 33 your shoes shiny and bright!