The London Underground in England is one of the few networks that uses a four-rail system. The additional rail carries the electrical return that, on third rail and overhead networks, is provided by the running rails. On the London Underground, a top-contact third rail is beside the track, energized at +420v DC, and a top-contact fourth rail is located centrally between the running rails at 210v DC, which combine to provide a traction voltage of 630v DC. London Underground is now upgrading its fourth rail system to 750v DC with a positive conductor rail energised to +500v DC and a negative conductor rail energised to -250v DC. However, many older sections in tunnels are still energised to 630v DC. The same system was used for Milan's earliest underground line, Milan Metro's line 1, whose more recent lines use an overhead catenary or a third rail.
Where was the system similar to London Underground used as well?
Milan

In the context of political corruption, a bribe may involve a payment given to a government official in exchange of his use of official powers. Bribery requires two participants: one to give the bribe, and one to take it. Either may initiate the corrupt offering; for example, a customs official may demand bribes to let through allowed (or disallowed) goods, or a smuggler might offer bribes to gain passage. In some countries the culture of corruption extends to every aspect of public life, making it extremely difficult for individuals to operate without resorting to bribes. Bribes may be demanded in order for an official to do something he is already paid to do. They may also be demanded in order to bypass laws and regulations. In addition to their role in private financial gain, bribes are also used to intentionally and maliciously cause harm to another (i.e. no financial incentive).[citation needed] In some developing nations, up to half of the population has paid bribes during the past 12 months.
What is the minimum amount of people that can be involved in a bribe?
two

Honors and tributes flowed to Bell in increasing numbers as his most famous invention became ubiquitous and his personal fame grew. Bell received numerous honorary degrees from colleges and universities, to the point that the requests almost became burdensome. During his life he also received dozens of major awards, medals and other tributes. These included statuary monuments to both him and the new form of communication his telephone created, notably the Bell Telephone Memorial erected in his honor in Alexander Graham Bell Gardens in Brantford, Ontario, in 1917.
What did Bell receive from many centers of post-secondary education?
honorary degrees