The surprising new idea that is reshaping how we think about ADHD

 (Timo Lenzen for The Post)

Scientists are starting to uncover the links between being a night owl and some neuropsychiatric conditions.

By Ariana Eunjung Cha

El Niño has reached record strength. See where extreme weather may unfold.

Army report cites systemic flaws that led to fatal DCA midair collision

At 81, he’s the most-cited nutrition expert. Here’s what he eats in a day.

‘No other place to live’: These five states are underrated

Inside Trump’s push to bring Christopher Columbus to the White House

Isaias becomes first Atlantic hurricane of the season. These areas are most at risk.

Trump says ‘we protect our cities’ after suggesting Iran could ‘take out’ L.A. or San Diego

We reviewed $1.6 billion of campaign ads. Here are the takeaways.

A year into Trump’s peace plan, Netanyahu stands in the way of rebuilding

Why retirees are going back to work

How to change your personality for the better later in life

More physical activity may mean slower Parkinson’s disease progression

Sens. Merkley and Daines: Our bipartisan plan would reform the U.S. Senate

Let my ex keep our dog in the breakup? Give advice to this Hax question.

Arepas! Astronauts! Test your knowledge this Hispanic Heritage Month.

 (Illustration by Chloe Meister/The Washington Post; Kevork Djansezian/Getty)

Explore the people, culture and history of Hispanic and Latino communities through these trivia questions.

By Courtney Kan and Alexandra Tirado Oropeza

Latino children share how they’re figuring out their place in the United States

An appreciation of a uniquely American language: Spanglish