Language evolves by taking unacceptable language and making it acceptable. The New York Times Science Section had an article on this last year. Many words in common usage were "swear words" or unacceptable a generation ago. See: http://en.wikipedia.org/wiki/Profanity
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Please define "olden days" because each time had different things. To some people 1950 is the "olden days".
olden days irons were built using stone or antique metal
In the olden days, the form of trade that existed in South Africa was barter trade. This means that instead of using money, people would exchange goods for other goods or services.
People used smoke signals, drums and some people had messengers. Yes people did communicate by drawing on rocks which are called rock paintings.
It depends on what you mean by 'olden days' - ancient peoples had to have most messages hand-delivered, often over hundreds of miles. In some cultures, carrier pigeons would be used to send and receive letters. In this county, native Americans might use smoke signals in a way similar to Morse code; later there was the Pony Express, then the teletype (telegram); and finally modern phones and digital communication - just like this!