A range of devices are available for teachers to use in producing materials for evaluation. (naesp.org)
These moments work because they're unexpected and different, forcing us to look at centuries - old, repeatedly produced material in ways that one might not previously have considered. (markreviewsmovies.com)
Two solids made of the same elements but with different geometric arrangements of the atoms, or crystal phases, can produce materials with different properties. (sciencedaily.com)