Although an infant's color vision is not as sensitive as an adult's, it is generally believed that babies have good color vision by five months of age. Most babies start crawling at about 8 months old, which helps further develop eye-hand-foot-body coordination.
A language tree, or family tree with languages substituted for real family members, has the form of a node-link diagram of a logical tree structure. Such a diagram contains branch points, or nodes, from which the daughter languages descend by different links.
Coding up a Trie (Prefix Tree). The tree data structure is one of the most important data storage mechanism in programming. It's a natural way to represent essential utilities on a computer like the directory structure in a file system. Trie, also called a Prefix Tree, is a tree structure that stores words with a common prefix under the same sequence of edges in the tree eliminating the need for storing the same prefix each time for each word. From Wikipedia: