A company has come up with a new kind of glow-in-the-dark paint. What’s special about it is this: it doesn’t need light to "charge", AND the glow will last for 12 years before it fades (12 years is the "half-life").
The light is not strong — don’t expect it to replace light bulbs. It puts out about as much radience as those glow-in-the-dark sticks. But being in paint, you can cover a wide area. The downside is that you can’t turn it off, so I wouldn’t recommend painting your walls with the stuff. It can (and probably will) be used in fabrics as well — it’s (supposedly) non-toxic and safe.
I can see it as being practical for, say, stop signs. And graffiti artists will have a field day.
So it’s time for all of us to learn a new word: "litroenergy".
You can read more about it here.