1

2

3

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5 6

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24

1 Texas LED scientific calculator 1971. (Glowed in the dark and batteries lasted about an hour!) 2 Short Messaging Service (Text) 1992 3 Sinclair ZX81. One of the first home computers. 1K RAM 1981 4 Microwave oven. Invented 1946 5 Mobile phone. Mobile telephony has been around since ~1930 via HF radio. First handheld available in 1973 6 LED digital watch 1978 7 Colour TV 1953 8 Sony Walkman 1979 9 DVD 1995 10 Email 1971 11 IBM PC 1981 12 Facebook 2004 13 Mouse concept developed by Englebart in1967. Later, part of the Alto conceptualisation in 1972 14 Smartphone. The IBM Simon1993. Pager, calculator, email, address book etc. $900 15 ATM 1967 16 Search engine. 1990 (used for searching FTP archives – no WWW at that time) 17 Amazon 1995 18 WWW 1990 19 VHS video recorder/player 1978 20 Fax machine 1843. 1975 in a version that we would recognise. 21 Apple Mac 1984 22 Wikipedia 2001 23 Psion Organiser 1984 2K RAM. Note non-QUERTY keyboard 24 GPS 1973. Fully operational 1994, Satnav 1995.

Correct order:

1843 – 20 (Fax machine or 1975 in a version that we would recognise)

1946 – 4 (Microwave oven)

1953 – 7 (Colour TV)

1967 – 13 (Mouse concept developed by Englebart, later part of Alto in 1972) and 15 (ATM)

1971 – 1 (Texas Scientific Calculator) and 10 (Email)

1973 – 5 (Mobile phone – handheld though around since 1930) and 23 (GPS – fully operational -

1994, Satnav – 1995)

1978 – 6 (LED digital watch) and 19 (VHS video recorder / player)

1979 – 8 (Sony Walkman)

1981 – 3 (Sinclair ZX81) and 11 (IBM PC)

1984 – 21 (Apple Mac) and 23 (Psion Organiser)

1990 – 16 (Search engine – used to search FTP archives) and 18 (www)

1992 – 2 (SMS)

1993 – 14 (Smartphone – the IBM Simon)

1995 – 9 (DVD) and 17 (Amazon)

2001 – 22 (Wikipedia)

2004 – 12 (Facebook)