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Has anyone — a parent, teacher, or boss — told you to purge the words "um" and "uh" from your conversation?

When these words creep into our narrative as we tell a story at home, school, or work, it's natural to feel that we can do better with our speech fluency.

The goal is simple: a drug that can relieve chronic pain without causing addiction.

But achieving that goal has proved difficult, says Edward Bilsky, a pharmacologist who serves as the provost and chief academic officer at Pacific Northwest University of Health Sciences in Yakima, Wash.

"We know a lot more about pain and addiction than we used to," says Bilsky, "But it's been hard to get a practical drug."

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MICHEL MARTIN, HOST:

An unmanned Antares rocket successfully lifted off from Wallop Islands, Va., on Sunday, taking with it 7,400 pounds of supplies to the International Space Station.

The launch took place just around 7:19 a.m. ET.

Here's a video:

Often, as we go through the world, the key is to ask the right question.

When it comes to figuring out the nature of physical reality, part of that process starts at the absolute edge of the observable universe — the cosmic horizon, a distant layer from which light has only just, in this very instant, managed to reach us after more than 13 billion years of racing through space.

This intangible boundary between the knowable and the unknowable is, at present, roughly a thousand, trillion, trillion meters across — should you possess the means to measure it.

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