If you want to do something to help children without any particular work on your behalf, then consider using the BluePage search engine. It pulls its content from Yahoo! and any money that is generated via clicking on a link goes to children's charities.
The 'About us' page says:
"Brought up in a modest family in Morocco, we witnessed our parents’ fear of not being able to afford our school expenses. Therefore, we immigrated to Canada and, thanks to the opportunities offered by this country, we were fortunate enough to study to become, for one, a computer engineer, and the other, a medical student.
We founded Bluepage in 2012 in order to offer this same privilege to children who aren’t so fortunate, children who didn’t choose to be born in areas of impoverishment, children who could be our next Albert Einstein, Nelson Mandela or Louis Pasteur. Our mission is simple: give a platform to charitable organisations on which they can connect with people who wish for a better world, without changing their online habits or making donations. To do so, we developed a system to salvage a small part of the 30 billion dollar annual revenue generated by online advertisement.
This ambitious project has been made possible by the support of Bluepage Technology. In order to make primary education accessible to all, our different partners, organisations like UNICEF, collect the majority of the profits gained through advertisement. The rest of the money is used by Bluepage to keep this website available and offer the world an innovative platform that, simply, makes a difference."
As a search engine, it's not particularly interesting if I'm honest, but then, that's not really what the purpose of this engine is. If you can just take a look, do a quick search, and if it's appropriate, explore an advert or two - even if it's just once - it'll be a help to people who really need it.