Identify each of the following about some things that are preventing you all from dying right now  for the stated number of points.  
Identify each of the following about some things that are preventing you all from dying right now  for the stated number of points.  [5 points] These are generally cylindrical, neutron-absorbing assemblies whose motions have an effect on the reactivity of a nuclear fission reactor. These come in "grey" and "black" varieties and central ones may have reactivity worths on the order of several cents.
Identify each of the following about some things that are preventing you all from dying right now  for the stated number of points.  
control rods