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Think before you post.

That's not the message you typically get from Internet companies. The ethos on Facebook, Twitter and Instagram is to (over) share. But Nextdoor, a social network, has decided to block users from publishing certain posts, specifically when they appear to be racial profiling.

A techie tackles race

Talking about race and racial profiling does not come naturally to Nirav Tolia, the CEO of Nextdoor. And yet, he's doing it anyway.

Do you know that feeling when a song moves you so much, you just feel like you have to add your own voice? Mexican culture has an answer to that: a cathartic, joyous yell called a grito.

Legendary Mexican performer Vicente Fernández, aka "Chente," performs the crazy tragic love song "Volver, Volver." "It's one of the most iconic mariachi songs of all time, performed by the most popular Mexican mariachi vocalist ever," says alt.latino's Felix Contreras. "And there is a championship grito at the top of the song."

As a new school year gets underway, the Common Core remains a partisan flashpoint, while Americans overall have serious concerns about the direction of our public education system. That's according to two new polls.

What the London Tube looks like past midnight

Aug 22, 2016
Orlando Gili/PRI

Something unusual happened on London on Friday night. The Tube — officially the London Underground — opened up two of its lines for 24-hour service.

Since its creation in the 19th century, the Tube has never been a 24-hour service. Most lines close around midnight.

That's left generations of Londoners ending their evenings in a mad dash — like Cinderella — to make it on to the last Tube heading home.

Documentary photographers Orlando Gili and Joseph Fox and spent Friday night riding the Tube, capturing the extended-hours mood. Here's what they saw.