Boing Boing points out a California school district that accidentally shortened a bunch of school days, resulting in a net loss of about 2 instructional days over the course of the year. Sounds easy enough to make up, right? I mean, it's not like schools in this part of the country that regularly extend the school year by 3-5 days due to winter weather. Well....

An internal audit in early May discovered that 34 minimum days had been 175 minutes at Dickson and 170 at Rolling Ridge, said district spokeswoman Julie Gobin. That adds up to a shortage of 170 and 340 minutes, respectively, which could be made up in one or two school days. But under state law, these too-short days do not count at all, meaning that all 34 must be made up to avoid a state penalty of more than $7 million.

You have to follow the link to see the picture - it looks like the extended school year only applies to a few grades - which means that some kids will get to have entirely too much fun taunting their siblings...