The most frequent reason: a lack of urgency.

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For this reason overlapping is frequent and impedes efficiency.

UNESCO: Introduction

In addition to splitting our attention, there is strong reason to suspect that frequent smartphone use and the constant connectivity it engenders interfere with memory formation.

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For this reason, publication has become as important to Zega and Dams as their frequent exhibitions at Galerie de Bayser in Paris and Didier Aaron in Manhattan.

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But frequent business travelers always try to hold on to their travel gear for a simple reason -- the inexcusably long time it takes for checked-in luggage to make it to baggage-claim carousels.

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We've got good news for frequent fliers in Europe and Australia: Qantas and Ryanair (this author's personal fav airline for obvious reason) have announced their respective additions of picocells for in-flight calling, texting, and presumably (eventually) also data.

ENGADGET: Ryanair, Qantas (finally) adding in-flight calling!