Back at MIT, we used to drop a big bar of Sodium in the Charles river once a year, for decades, until…
“The Sodium Drop traditionally consisted of a bar of metallic
sodium dropped into the
Charles River, producing loud explosions due to the rapid
exothermic conversion of sodium metal to
sodium hydroxide and the ignition of the resulting
hydrogen gas. In the past, Sodium Drops occurred sporadically, initiated by impromptu groups of students from various dorms and fraternities.
However, in 2007, five volunteers using a boat to clean up trash from the river banks were injured by a small explosion and fire, apparently caused by unreacted sodium residue. MIT quickly donated funds to pay for decontaminating and repairing the boat, although it was not clear at the time who was responsible for the damage.
A criminal case was initiated, and a graduate student accepted responsibility, resulting in a fine and a community-service sentence. In addition, a long-running civil suit against a fraternity resulted from this incident, culminating in a six-figure out-of-court settlement. The student newspaper The Tech has published an editorial urging readers to take responsibility for any injuries to innocent parties that result from the prank.”