Life sentences do not always mean life in prison without parole. People with 1 life sentence can get out well before their death if they are paroled. By giving 2 consecutive life sentences, the person begins serving the 2nd one as soon as paroled for the first, thereby making it closer to an actual life sentence.
For skewed distributions, it is quite common to have one tail of the distribution considerably longer or drawn out relative to the other tail. A skewed right distribution is one in which the tail is on the right side. A skewed left distribution is one in which the tail is on the left side. The above histogram is for a distribution that is skewed right. Skewed distributions bring a certain philosophical complexity to the very process of estimating a typical value for the distribution.
Slewing bearing. A slewing bearing or slew ring is a rotational rolling-element bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill.