Well, that's a weird story (via the Chicago Sun-Times):
A former Bartlett High School chemistry teacher was found guilty Tuesday of charges alleging he injured a student during a science demonstration.
Garry Brodersen poured liquid nitrogen on a student’s chest and groin area while performing a demonstration for class on May 15, 2018, according to a statement from the DuPage County state’s attorney’s office.
The chemical caused burn injuries to the student’s groin and a finger, prosecutors said.
Brodersen, 66, of Carpentersville, was released on bond a $15,000 during the trial.
A jury deliberated for four hours after a two-day trial before finding Brodersen guilty of a count each of reckless conduct and endangering the health or life of a child.
Prosecutors statement here. I feel like it's unusual for this to reach the level of a trial? This seems a little bit odd - there must be some context missing. (Also, it seems like the decision to pour liquid nitrogen directly on a student was... unwise.)