How should you saw a block of stone of 40 kg into four pieces such that you can measure all weights of an integer from 1 kg to 40 kg (so 1 kg, 2 kg, 3 kg, 4 kg, ..... 39 kg and 40 kg) on a balance?

A country far away is called the country of no idea. In this country there live people but no children, they have houses but no cities and villages. The people have cars, but there are no roads. They people are very clean but you won't find a single dustbin in the country of no idea. Why is it called the country of no idea?

You can be the last joining person, but you will never be first. What is it?