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Renaissance art
Renaissance art took place in Europe during the fourteenth, fifteenth...
Rainforest
The rainforest is one of the many biomes that we can...
Rubidium
Rubidium is a chemical element of the periodic table, its...
Rational numbers
Rational numbers represent the set of numbers that can be fractionated...
Roman law
Roman law is the group of principles of law that have been...
Right triangle
The right triangle is the triangle that has a right angle which has a...
Right of petition
Right of petition is the right of every citizen, either individually or legally...
Ruthenium
Ruthenium is a metallic chemical element of the periodic table of...
Rail transport
Rail transport is an important means of transport in vehicles that are...
Roguelike
Roguelike is an exploration game aimed at the player using chips and...
Runoff
Runoff is an important phase of the hydrological cycle and it is...
Running track
The running track is an area in which athletics races are held. It is...