What happens to a t-distribution as the degrees of freedom increase?

One of the interesting properties of the t-distribution is that the greater the degrees of freedom, the more closely the t-distribution resembles the standard normal distribution. As the degrees of freedom increases, the area in the tails of the t-distribution decreases while the area near the center increases

hope it's help

the blue glow lasts for about 30 seconds per application. detecting the glow requires a fairly dark room.