In brief

South Korea will spend US$1.49 billion between now and 2020 on its 5G wireless network, which is expected to be 1,000 times faster than the 4G service allowing users to download an 800 megabyte film in one second. An experimental strontium atomic clock has set new world records for both precision and stability. The clock is so precise it would neither gain nor lose one second in about 5 billion years. 24th January 1984 saw the release of the first Macintosh computer. A 128K RAM version had a $2,500 price tag.