As Professor Farnsworth says in Futurama — Good news everyone!
According to Ananova, two Bosnian brothers have been found to have 4 working kidneys each:
Josip Galic, 69, from Kucetine in Bosnia said: "I had a car accident and doctors discovered I had four kidneys. That surprised me, but at least it explained why I could drink all my friends under the table, and never had a hangover."
He added it was a further surprise when his brother found out after a visit to the doctor that he had four kidneys as well.
Handy, no? I mean, I know that one of your kidneys is technically a spare since you can function with only one, but multiple backups are definitely the way to go.
[via 2lmc spool]