The Health and Safety Executive (HSE) is a non-departmental public body of the United Kingdom. It is the body responsible for the encouragement, regulation and enforcement of workplace health, safety and welfare, and for research into occupational risks in England and Wales and Scotland.
Sparkfun is a retail shop online, but it also offers resources, tutorials and guides on technological issues.
It provides answers to common questions. They are grouped in different categories.
Wikipedia is the free encyclopedia containing more than 32 million articles in 280 languages. It is widely used as reference work.