If you want to change the world, invest in a girl. Today marks the second anniversary of International Day of the Girl, instituted by the United Nations General Assembly to promote the rights of girls, highlight the unique challenges they face around the world, and reaffirm a global commitment to protect and empower them. Given worldwide violence, extremism, poverty, and injustice, we cannot afford to cast aside the contributions that 850 million girls can make to build a safer, more prosperous, and equitable world.

Pakistani schoolgirl Malala Yousafzai has become a formidable force for rights in the year since the Taliban shot her, but an equally formidable public relations operation has helped her spread her message. The 16-year-old campaigner for girls' education has been nominated for the Nobel Peace Prize, addressed the UN, published an autobiography and been invited to tea with Queen Elizabeth II, achieving a level of fame more like that of a movie star.

Since its completion in 1952, the flat, rectangular, modernist masterpiece on the East River, that is, the United Nations Headquarters has been the site of much geopolitical intrigue as well as a backdrop for films like North by Northwest. It even makes an appearance in the video game, Grand Theft Auto IV. But now for the first time, you or I or anyone can build the UN one LEGO brick by LEGO brick.

If you’re of Pakistani origin, as I am, and if you long to see that embattled country right itself, the saga of Malala Yousafzai can drive you to tears. Not just tears of joy for the way she was a favorite for this year’s Nobel Peace Prize. Not just tears for how she captured the imagination of Westerners who want to believe the best about Pakistan’s hopes and prospects. More than anything, they are tears of frustration, caused by the manner in which many Pakistanis reject her.

Colombia, led by its second largest city Medellin, has the most unequal urban areas in Latin America, according to the United Nations. While Latin America as a whole has been making strides to combat inequality, lowering rates of unequal income distribution across the region over the past decade, Colombia has bucked the trend, experiencing a 15 percent increase in inequality in urban areas over the last 20 years.

Countries all over the world, dictatorships and democracies alike, have in the last few years sought to tame — or plug entirely — that real-time fire hose of public opinion known as Twitter. But on the sidelines of the General Assembly meeting over the last couple of weeks, ministers, ambassadors and heads of state of all sorts, including those who have tussled with Twitter the company, seized on Twitter the social network to spin and spread their message.

Iran's parliament strongly endorsed President Hassan Rouhani's diplomatic bid to dispel mistrust at the United Nations last week during a visit which ended with an historic phone call with President Barack Obama, Iranian media said. The backing from the assembly, controlled by political factions deeply loyal to Supreme Leader Ayatollah Ali Khamenei, is a further sign that Rouhani has the support of the Iranian establishment, though there are some rumblings from hardliners.