Researchers say people are more likely to use text-based communication at the preliminary stages of projects.

Copies of many of the classical texts used by sixteenth-century teachers, including marginal notes describing the oral lessons that were based on the texts, can be found in museums today.

Think of something as seemingly benign as the cellphone—we have microfinance and text-based social networking at one end of the spectrum, and improvised explosive devices at the other.