<human>: My son (8, 3rd grade, small) has, for the past few weeks, been telling me about this other boy at school who has been bothering him.  The other boy is in 4th grade and is big for his age.  Apparently this older boy has been calling my son names and pushing him down on the playground.  Today, my son came home with a huge scrape on his arm from where he fell when this other boy pushed him down; this was when he finally admitted it had gone beyond verbal stuff.  He says he talked to his teacher, but he now he does not feel safe at school.  We lost his dad last year, so his "protector" is gone and it's just me.  I'm so upset I'm shaking, and I'm trying to formulate a plan for what to say when I talk to his teacher and principal.  Any of you out there have a similar experience or advice to share?  I'd be very grateful.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Older kid picking on my son, and hurt him today.  Looking for help from anyone who's been in a similar situation.