You often have to make quick judgments about the number of objects you encounter in the world. You might see a group of people walking toward you. It is useful to know whether there are roughly five, ...

Infants and animals are able to understand approximate quantities of different types, in terms of relative proportions of the numbers of different sets of objects, provided the difference in numbers ...

Students will be able to explain that the parts of an object can be rearranged to create a new object. Students will also get a sense of the number of different objects that can be created from a ...

After embarking on its third mission, China’s top-secret spaceplane, dubbed Shenlong, has released six mysterious objects into Earth’s orbit — and we have no idea what they are. On December 14, the ...