Thanks to technological development, people have gone through tremendous changes in means of communication in the past 40 years— from postal letters at the beginning to phones to instant messages.

Information Overload, Then and Now By Ann Blair November 28, 2010. ... Starting in the 13th century, the scholastics devised powerful new tools, notably the alphabetical index ...

Thanks to technological development, people have gone through tremendous changes in means of communication in the past 40 years— from postal letters at the beginning to phones to instant messages.