| It occurred to me, however, that triboluminescent materials, which emit light only when fractured, could offer a better approach. |
| Sources of light appear bright because the radiation that they emit enters the eye directly. |
| The flowers do not bloom until nightfall, when they emit a mouse-like odour, and bats visit them for nectar and pollen. |
| It's during this time that male humpbacks emit vocalizations that sound, at least to human ears, like barks, chirps, and moans. |
| Unless the ship was scanned, it was invisible, since its engines were tuned to emit only in the ultraviolet. |
| When excited, the binturongs emit a variety of grunts and hisses, say researchers. |
