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...changing and evolving, due to the movements of tectonic plates that make up our rocky crust. Mountains grow in the collision zones between plates over millions of years, but their presence is only transient as they are slowly eroded away again. The science of 'geochronology' How do we know the timescales, and effectively the history of a mountain range? One way we work...

...Changing the intensity of the light caused the number of electrons emitted to change, but the electrons’ range of energies remained the same. Decreasing the wavelength of the light, however, caused the electrons to be emitted with a higher maximum energy. Conversely, increasing the wavelength of the light beyond a particular cut-off value (specific to each metal),...

...changes underfoot,” Melissa Leach, director of IDS, told the meeting. “The stakes in this, I must emphasise, couldn’t be higher.” Mass unemployment is one; loss of revenue for governments is another; and then there's the disproportionate effect on women workers. Amongst the worried development crowd was a sprinkling of more optimistic technologists and government...

...change in our world. Design engineering has helped to transform the environment, create incredible super-structures on land and sea, and even helped people travel to, and live in, space (Figure 1). [Described image] Figure 1 Examples of design engineering: (a) the Hoover Dam; (b) the Millau Viaduct; (c) the International Space Station At the same time some of the smallest...