Capitalization

I have four children in school now. Two in the 5th grade & two in the 10th grade. They are now being taught, when typing, to only leave one space at the end of a sentence instead of two. I asked one of their teachers about it and she told me that she didn't like it either but that it was now the accepted way of doing it in college & they were being told to teach children to do it that way. She said it was being done to save space on the paper!