We conducted a study to assess the promotion of eye protection on websites that advertise, educate, or promote the use of power tools. Ethical approval was not sought for the study. A systematic ...

THE appearance of the first volume of this most useful adjunct to the work of the scientific ornithologist has already been welcomed in NATURE. It is a book purely for reference, consisting of a ...

A new archaeological study has revealed the earliest ever systematic mining and exploitation of coal by humans for fuel. Humans have been in the search for new sources of fuel to exploit for energy ...

Systematic sampling means testing a hypothesis by taking several equally spaced items from a larger list, eg selecting the tenth, 20th and 30th visitor to a theme park. This can be particularly useful ...