Mr Schafer hopes that he will one day be able to sit in a rural school and watch a hologram of the New York Philharmonic play the music he loves.

ECONOMIST: Can the rules be bent just enough to keep them alive?

School days have been extended and play times will be staggered in an effort to thin the crowds of students.

ECONOMIST: Swine flu in Egypt

The new guidelines also are more in line with laws in 43 states and the District of Columbia that require youth and high-school athletes to be removed from play and to return only after at least 24 hours and with the permission of a health-care professional.

WSJ: Tougher Rules Advised for Athletes After Concussion

Athletes in high school and younger who sustain a concussion should be managed more conservatively regarding a return to play, the AAN warns, since they take longer to recover than college-age athletes.

WSJ: Tougher Rules Advised for Athletes After Concussion