Right about the year my grandmother got her own cellphone, I realized that, in today's world, when someone is difficult to reach, it's by choice. Now, I'm just waiting for everyone else to make that realization. "I didn't get your message," "My machine is broken," and "I meant to call you back," are all euphemisms for "I didn't feel like talking to you." And it isn't anything to get upset about, either. Today's constant connectivity is exhausting, and it's perfectly natural for people to spend their energies selectively.