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Solar cells convert light energy to electricity. The photovoltaic effect was first demonstrated by Becquerel in 1839. It has recently achieved a level of almost 45 percent efficiency. A 5x5 ft solar cell could be screwed to the side of your house and meet all of your energy needs.
The Internet of Things
The "Internet of Things" refers to objects that can be uniquely identified with an addressable system such as TCP/IPv6. IPv6 with its 128-bit address has scope to have a unique address for every single item in the world. There are approximately 3.4 x 1038 addresses available for use.
You could even give each of your socks unique addresses to ensure that you will never mis-match them again.
Image: Wireless Broadband
Transistors were first developed in 1947 by Bell Laboratories and allow precise control of the flow of current through circuit boards. A transistor is the active component in almost all modern electronics systems. Moore’s law predicted that over the history of computing hardware the amount of transistors in integrated circuits will double every two years, influencing their impact on the evolution of technology.
Image: Wikimedia Commons