Probably, you think that carrying out tests is possible only in a laboratory, and man that it does, in your presentation is a scientist in a white dressing-gown. Actually all a bit not so. Remember how you are glad, when suddenly after a rain see a rainbow in sky, but she without ceremony can appear and in your apartment. Certainly, you are sure that if to prick an air marble the button, then he will burst necessarily. And is not it suddenly? Do not you want to check? As you do you think, can cold water boil? And does can it is needed to try to lead jelly-fish of house or compel to move paper "гусеницу"? If you want to know, what a result of numerous experiments that without effort can be conducted houses will be, and to learn to explain all laws of the surrounding world an experimental way, then rather open this book and proceed to reading! Spend time with a benefit - and you will do for itself the unbelievable opening and you will surprise the friends, it would seem, by inexplicable facts.For junior and middle school age.