In a modern democracy, the group of elected representatives who exercise the legislative power. In some countries, the legislative assembly is split in two groups or houses[?], the second of which (sometimes called the Senate, as in France and the United States) is composed of more experienced statesmen and is supposed to act as a moderating influence on the first assembly. In most countries, the head of state has the right to vetolaws passed by the legislative assembly.
... physics of this device looks confusing at first sight, but is surprisingly simple. It can easily be understood with a little knowledge of gyroscopes. Their striking ...