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MJH, it's OK Chinabiker has been on a wind-up. What yoiu wrote is exactly correct.

Lao Jia Hou, I also don't understand how having a headlight on uses fuel, albeit my understanding (or lack of) is somewhat simpler...

Logically a headlight draws it's power from battery which is...

China is a country where actual scientific fact plays a secondary importance to 'common knowledge'.

A few gems over the years:
- A woman that eats an ice-cream when breast feeding will make the...