Manifold facts for kids
A manifold is a concept from mathematics. Making a manifold is like making a flat map of a sphere (the Earth).
The Earth is a sphere, a three dimensional object of geometry. Yet, maps (twodimensional representations) can be made of the Earth. At the edges of a certain map, the map needs to be changed. That way it is possible to make a two dimensional image of the whole surface of the Earth. There need to be rules, on how to change the maps, and some areas (near the edges of the map) will be on more than one map. It is not possible to make one map only, which would have no edges. This map would either have edges (and overlapping areas), or there would be some places where the paper was torn. Tearing and overlapping isn't allowed.
Each manifold has a dimension. This is the dimension of the maps, in the example above. It is the same for all maps.
Images for kids

The surface of the Earth requires (at least) two charts to include every point. Here the globe is decomposed into charts around the North and South Poles.

A Morin surface, an immersion used in sphere eversion