Tim Ogden is challenging the thinking of two of the world’s most prominent donors — Bill and Melinda Gates — as self-described “impatient optimists,” notes Give and Take in its daily digest of the best blog posts about the nonprofit world.

Plus:

• New books trigger a robust debate on how to solve global poverty.

• The meaning behind last week’s national hunger statistics.

• The power of a well-placed thank you.

• Analysis of the work of Philanthropedia, which connects people with giving experts.

• A satirical suggestion that a commission of African leaders overhaul the band U2.

• How to teach 5-year-olds about philanthropy.