Making laws
nuclear option
Changing Senate practice by majority vote instead of the two-thirds a formal rules change needs, by overruling the chair on what the rules mean.
In full
Amending the Senate's standing rules requires a supermajority, so majorities have instead used a point of order and an appeal to establish a new precedent with fifty-one votes. It was used in 2013 to end filibusters of most nominations and in 2017 to extend that to the Supreme Court. Nothing about it is nuclear except the norm it spends: a precedent, once set, is available to whoever holds the majority next.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.