Latest Purpurin Stories

Researchers Make Greener Batteries From Plants
2012-12-12 13:57:57

We use batteries for almost every electronic device under the sun. But every point in the lifespan of these energy cells, from production to disposal, is fraught with environmental hazards.

Word of the Day
  • A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
The word 'pawl' probably comes from a Latin word meaning 'stake'.