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26th January 2017
09:58am GMT

(Image via health and safety executive)
It is worth knowing that 0.1g is in the average cup of coffee.
Both men were treated in intensive care and on dialysis and have reported lasting effects including memory and weight loss (and we're guessing some serious insomnia)
The judge presiding over the case said the students most likely only survived because they were fit young men.
The university was fined £400,000 for the incident which happened in 2015.Explore more on these topics: