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TERM 1: PHYSICS
TERM 2: BIOLOGY
TERM 3: CHEMISTRY

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In terms of absolute height, the tallest structure is currently the Burj Dubai, although it does not currently hold the official title of "Tallest Building in the World" until the building is officially opened. The current official holder of the "Tallest Building in the World" is held by Taipei 101. In addition, there are dozens of radio and television broadcasting towers which measure over 600 metres (about 2,000 feet) in height. There is, however, some debate about:

* whether structures under construction should be included in the list
* whether structures rising out of water should have their below-water height included.

For towers, there is debate over:

* whether guy-wire-supported structures should be counted

For buildings, there is debate over:

* whether communication towers with observation galleries should be considered habitable buildings.
* whether only habitable height is considered.
* whether roof-top antennas should be considered towards height of buildings; with particular interest in whether components that look like spires can be either classified as antennas or architectural detail.

The Council on Tall Buildings and Urban Habitat, the organization that determines the title of the "World’s Tallest Building," recognizes a building only if at least fifty percent of its height is made up of floor plates containing habitable floor area.[1] Structures that do not meet this criterion, such as the CN Tower, are defined as "towers."
(http://en.wikipedia.org/wiki/List_of_tallest_buildings_and_structures_in_the_world)

Wow... I've never heard of the Burj Dubai but it sure sounds interesting...

And Singapore's tallest building is the UOB Plaza One, ranked 65 tallest in the world, at 280 m, a whopping 66 floors. It's followed closely by, also from Singapore, the Republic Plaza (which is actually tied with the UOB Plaza One, but was built 3 years later) and the OUB center, at 63 floors.