A bridge is built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. Designs of bridges vary depending on the function of the bridge and the nature of the terrain where the bridge is to be constructed. Contents 1 History of bridges 2 Etymology 3 Types of bridges 3.1 By use 3.2 Decorative and ceremonial bridges 4 Bridge structural and evolutionary taxonomy 5 Efficiency 6 Special Installations 7 Visual index 7.1 Index to types of bridges

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A day (symbol: d) is a unit of time equivalent to 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The term comes from the Old English dg, with similar terms common in all other Indo-European languages, such as dies in Latin and dive in Sanskrit. Contents 1 Definitions 1.1 International System of Units (SI) 1.2 Astronomy 1.3 Colloquial 2 Introduction 3 Civil day 4 Leap seconds 5 Astronomy 6 Boundaries of the day 7 Metaphorical days

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