Brain Age: Train Your Brain in Minutes a Day!, also known as Dr. Kawashima's Brain Training: How Old Is Your Brain? in PAL regions, is an entertainment video game that employs puzzles. It was developed and published by the video gaming company Nintendo for the Nintendo DS handheld video game console. Nintendo has been careful not to claim the game has been scientifically validated, however stating that it is an "entertainment product 'inspired' by Kawashima's work in the neurosciences."

It was first released in Japan, and was later released in North America, Europe, Australia, and South Korea. It was followed by a sequel titled Brain Age 2: More Training in Minutes a Day!, and was later followed by two redesigns and Brain Age Express for the Nintendo DSi's DSiWare service which uses popular puzzles from these titles as well as several new puzzles.

Brain Age features a variety of puzzles, including stroop tests, mathematical questions, and Sudoku puzzles, all designed to help keep certain parts of the brain active. It was included in the Touch! Generations series of video games, a series which features games for a more casual gaming audience. Brain Age uses the touch screen and microphone for many puzzles. There has been controversy over the game's scientific effectiveness.

The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few invertebrates such as sponges, jellyfish, adult sea squirts and starfish do not have one, even if diffuse neural tissue is present. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste, and smell. The brain of a vertebrate is the most complex organ of its body. In a typical human the cerebral cortex (the largest part) is estimated to contain 15–33 billion neurons, each connected by synapses to several thousand other neurons. These neurons communicate with one another by means of long protoplasmic fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells.

From an evolutionary-biological point of view, the function of the brain is to exert centralized control over the other organs of the body. The brain acts on the rest of the body either by generating patterns of muscle activity or by driving secretion of chemicals called hormones. This centralized control allows rapid and coordinated responses to changes in the environment. Some basic types of responsiveness such as reflexes can be mediated by the spinal cord or peripheral ganglia, but sophisticated purposeful control of behavior based on complex sensory input requires the information-integrating capabilities of a centralized brain.

Age may refer to:

A railway or railroad train is a connected series of vehicles for rail transport that move along a track (permanent way) to transport cargo or passengers from one place to another place. The track usually consists of two, three or four rails, but might also be a monorail or maglev guideway.

Propulsion for the train is provided by a separate locomotive, or from individual motors in self-propelled multiple units. Most modern trains are powered by diesel locomotives or by electricity supplied by overhead wires or additional rails, although historically (from the early 19th century to the mid-20th century) the steam locomotive was the dominant form of locomotive power. Other sources of power (such as horses, rope or wire, gravity, pneumatics, batteries, and gas turbines) are possible.

The word 'train' comes from the Old French trahiner, itself from the Latin trahere 'pull, draw'.

There are various types of trains that are designed for particular purposes. A train can consist of a combination of one or more locomotives and attached railroad cars, or a self-propelled multiple unit (or occasionally a single or articulated powered coach, called a railcar). Trains can also be hauled by horses, pulled by a cable, or run downhill by gravity.

Minutes, also known as protocols, are the instant written record of a meeting or hearing. They typically describe the events of the meeting, starting with a list of attendees, a statement of the issues considered by the participants, and related responses or decisions for the issues.

Minutes may be created during the meeting by a typist or court recorder, who may use shorthand notation and then prepare the minutes and issue them to the participants afterwards. Alternatively, the meeting can be audiorecorded or a group's appointed or informally assigned Secretary may take notes, with minutes prepared later.

It is usually important for the minutes to be terse and only include a summary of discussion and decisions. A verbatim report is typically not useful. The minutes of certain groups, such as a corporate board of directors, must be kept on file and are important legal documents.

Most public meetings and governmental hearings follow prescribed rules. Often speakers' words are recorded verbatim, or with only minor paraphrasing, so that every speaker's comments are included. This is generally required at public hearings that are called to address a particular issue, as distinct from other types of public meetings, which may not strictly required verbatim records of all comments made. Companies are generally required to keep minutes of the proceedings of: (a) general meetings, (b) meetings of Board of Directors and (c) meetings of committee of the Board of Directors.^{[citation needed]}