I'll never understand why professors give take home exams and expect that the internet won't be used to help answer the questions. Even if he didn't just post t

I'll never understand why professors give take home exams and expect that the internet won't be used to help answer the questions. Even if he didn't just post the question without trying, who's to say a similar question isn't already there? Do History professors do this? I mean a math problem is something you might be unlikely to find on the internet, but I'm guessing wikipedia knows when the battle of Gettysburg took place. If you are allowing for "open book" but not "open internet" give the test in class and set their book on the table.