How does Superman know when someone needs help?

Me and a co-worker were talking about batman and the bat symbol, but how does Superman know when someone needs his help?





I tried to google it and could not find a answer. HELP!


|||One is his super hearing, and the other is why he works in a news room so he can get breaking new from all over the world.|||He uses his super hearing

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|||he works at the daily planet so he gets the big news there.


His friends are always in trouble so they call Clark for help.


When He patrols Metropolisis He has super hearing and x-ray vision.


=]

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|||He has super sonic hearing!


watch superman returns and you'll see.|||his super senses tingle|||he either sees it happening with his enhanced vision or he hears it with his enhanced hearing. he flies around a lot too. and maybe he has some kind of crystal ball in his fortress of solitutude.|||Someone just has to yell HELP! or SUPERMAN HELP! or blow something up. Then he comes a flyin!|||I agree that he has super sonic hearing. I remember when I used to watch the TV series he would be at work and he would hear people shouting, 'HELP!'|||He has super hearing.|||jimmy olsen has a signal watch


superman patrols metropolis quite often and has supervision and hearing and super speed so he get around quite a bit and has surveillance at the fortress and the jla watch tower j'onn jonn'z keeps in mental contact as well