of their many projects. They are dreamers and visionaries. They like to imagine vibrant communities bursting with culture — music, art, history, theater, film — and full of people realizing their potential. But they’re not only dreamers, they want people to be a part of their dreams.

Claire Diaz-Ortiz, leader of Social Innovation at Twitter Inc., and author of the book Twitter for Good, is brilliant in the international community of philanthropy and is someone all three writers on this post respect. Her ideas, and Twitter, have led countless people toward social good. The Networked Nonprofits we support – 2morrowknight with SeeYourImpact, Amy with United Way, and Yasamin with The 1010Project – are impacted by her work. And by Twitter. As are all of the men highlighted here. InGrasping the bull by the horns could soon be a distant memory for British dairy farmers after scientists genetically engineered male animals to rid them of their dangerous prongs.

Dairy cattle typically grow horns, which can injure farm workers, ramblers and dog walkers, so they are usually removed when the calf is young, in a process known as ‘debudding’.

As well as making the animal safer, dehorning also makes it easier to pack bulls into pens and trucks because horns take up space, but the process is extremely painful for the animal.

Now scientists at the University of California, Davis, have successfully bred hornless bulls after splicing the ‘hornless’ gene from Aberdeen Angus cattle into the widespread black-and-white Holstein dairy cows so that they are born without protrusions.

Instead they simply grow