Due to a phenomenon called the shape memory effect (SME), certain "memory metals" can be distorted and then brought back to their original shape by a simple temperature change. While a one-way memory effect has inspired applications since the '60s, and a two-way memory effect can also make objects remember two different shapes, scientists have recently discovered that the effect can now be realized at micro or nano scale on surface – dents can be turned into "mirrored" bumps.
While SME technology already surrounds us – from bendable eyeglass frames and surgical tools to anti-scald faucets and fire sprinklers – reversible SME will likely be exploited for an even wider range of optical, tribological (rubbing), and microelectromechanical applications. For instance, surfaces can become slippery or sticky by changing temperature, or signs can appear and disappear by heating and cooling.
More info can be found at Phys.org
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