The following lists events that happened during 1991 in Singapore. Incumbents President: Wee Kim Wee Prime Minister: Goh Chok Tong Events January 2 January – New machine-readable passports are issued. 11 January – The National Science and Technology Board is formed to enhance R&D activities in Singapore. 15 January – The five Shared Values of Singapore are adopted. February 23 February – Civics and moral education is introduced, replacing religious knowledge lessons in schools. March 2 March – The National Trades Union Congress launches two radio stations, NTUC Heart Radio 91.3 and NTUC Heart Radio 100.3. 16 March – The New Horizon Centre is officially opened, making it the first day care centre to look after those with dementia. 26 March – Four Pakistanis hijack Singapore Airlines Flight 117 and demand the release of Pakistan Peoples Party members from Pakistani jails. 27 March – Members of the Singapore Special Operations Force storm into Singapore Airlines Flight 117, killing all hijackers and freeing all passengers and crew members. May 4 May – Filipina domestic worker Delia Maga and her 4-year-old charge, Nicholas Huang are found murdered in their flat. Flor Contemplacion was subsequently tried for the murders and found guilty. 13 May – Underwater World opens its doors. 31 May – The Van Kleef Aquarium closes after falling visitorship. June 1 June – Changi Airport Terminal 2 is officially opened. 3 June – The first National Registration Identity Card (NRIC) replacement exercise takes place in MacPherson Community Club in a programme spanning three years. The programme replaces the existing laminated NRICs to credit-card sized ones with features for higher security. It will also indicate blood types for use in emergencies. 6 June – The Civil Defence Academy starts construction. When completed in 1995, the S$63 million complex spanning nine-hectares will train Singapore Civil Defence Force officers, as well as offer computer simulations. 29 June – IMM opens its doors. July 1 July - Nanyang Technological University (NTU) is formed as Singapore's second university, previously known as the Nanyang Technological Institute. The National Institute of Education (NIE) is formed from the merger of Institute of Education (IE) and the College of Physical Education (CPE). The institution is now part of NTU. August 1 August – The Singapore International Foundation is formed to help in diplomacy. 2 August – Two areas in Singapore, namely the Central and Changi areas are gazetted as Tree