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...Temps atomique international) officially began on 1 January 1958 and has been running steadily ever since. In 1967, the second was redefined as the duration of 9 192 631 770 periods of the radiation from the caesium atom. The definition, part of the International System of Units (or SI, from Système international), was chosen to match the duration of the astronomical...

...et al., 2014). The following text is a summary of this paper. After you have read it, complete Activity 6. Planetesimals are thought to be formed from the solid material of a protoplanetary disk by a process of dust aggregation. It is not known how growth proceeds to kilometre sizes, but it has been proposed that water ice beyond the snowline might affect this process. To...

...et al. (2015) p. 332...An introduction to interaction design: 4.4 Interaction design as a discipline - So far we have talked about interaction design as a process defined by specific activities and characteristics. However, more broadly, interaction design is a field of expertise to which a variety of disciplines contribute, such as psychology, sociology, graphic design...

...et al, 2014). High-level STEM skills are considered to be of key importance to the performance of the UK economy across the board – in terms of jobs, productivity, innovation and global competitiveness. Ensuring that businesses have access to these skills is particularly critical to the process of innovation and will therefore be increasingly important to the UK’s...