1 Myelin is an insulating material that, when itâs worn away or damaged, decreases nerve function. Damage to myelin is called demyelination.  There are different types of demyelination. These include inflammatory demyelination and viral demyelination.
1888 â Roundhay Garden Scene. The worldâs earliest surviving motion-picture film, showing actual consectuve action is called Roundhay Garden Scene. Itâs a short film directed by French inventor Louis Le Prince. While itâs just 2.11 seconds long, it is technically a movie.
Red Dawn, first PG-13 movie, is released. On this day in 1984, the action thriller Red Dawn, starring Patrick Swayze, opens in theaters as the first movie to be released with a PG-13 rating. The Motion Picture Association of America (MPAA), which oversees the movie rating system, had announced the new PG-13 category in July of that same year. Founded in 1922 as a trade group for the American film industry, the MPAA introduced its first-ever movie rating system in November 1968.