Steve

I have 47,000 sound data files from a hydrophone recorded over a period of months, some of which contain boat noises. I have an algorithm in matlab that gives me a list of files which might be boat noises. I listen to these files and record which ones really are. Then I have listened to 2% of the total number of files and recorded how many them are boats. I would like to know how I can use the results of listening to the random files to calculate how many boats I have missed in the rest of the files that I haven't listened to.

Symbols are everywhere particularly in the area of religious beliefs and basically act as badges of membership. Is it time atheists had a symbol we could hang on the wall or on a necklace or something? I promise this is a serious question. I was reading the question about being an atheist in Texas and one answerer referred to christians hanging symbols in their office cubicles. Do we need an atheist symbol of solidarity or so we can recognise each other? If you think we should then what would a good symbol be? NOT an upside-down cross thank you. And preferably not one that has been taken like the cannabis leaf.

I was in one of the categories, on the open questions tab with sorting set to ascending order of answer count ie 0 answers first. Some of the questions turned out to be deleted or resolved when clicked. Refreshing the top page did not clear these questions from the list. Is this a bug in the database query?

I'm sure that silver reflects more sunlight than white does and I would have thought that sunlight would be the big danger. Also the silver suits looked a lot more spacey. Basically, what was the technical reasoning behind changing the colour?