There is a single known exception, thanks to federal wiretaps.

Most insects do not possess nociceptors, one known exception being the fruit fly.

Low-temperature helium is the only known exception to the general rule.

These are the only known exceptions, all other atoms have at least one proton, neutron and electron each.

Most of them have circular genomes (the parvoviruses are the only known exception).

This is not the only known exception to Mendel's rules.

As of 2009, most of the bombers appear to be ethnic Chechens, with a few known exceptions.

It was often ignored in secular law but there is one known exception.

Brown says human universals, "comprise those features of culture, society, language, behavior, and psyche for which there are no known exception."

The only known exception to the "100 year rule" would be cars.