Toxicological trivia from November 20, 2009: 56% of poisonings treated at the Sertox by river stingray between 1990 and 1999 occurred between:
a) 8 to 12 hours;
b) 12 to 16 Hours;
c) 16 to 20 hours.

Correct answer c. Between 8 and 12 hours were 17.8% and between 12 and 16 hours, 20.5%. Read more in Spanish article: Stingray in Rosario.