One of the things  I like about my job is talking with people on the other side of the world. It’s an instant way to get perspective.

For one thing, they’re just ending their days while we’re just beginning ours. For another, they are dealing with problems we can barely imagine, problems like trying to keep food cold to prevent spoilage. (Pakistan loses almost 50 percent of its crops after harvest.)

I just heard a man who’s on the leading edge of change in that country, someone who tries to convince people they don’t have to do things the way they’ve always done them, describe walking into a cold storage facility filled with rats and mold. “I almost vomited,” he said.

But he saw the potential and made the connection that created change. These are not huge shifts. They are pebbles tossed into streams.

Toss enough of them, though, and you change the flow.