Vice President Joe Biden joins Massachusetts Gov. Deval Patrick at a ceremony in Boston in honor of the victims of the terrorist attack that took place at the annual marathon one year ago today. Timing of this event may be subject to change.

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Toronto mayor Rob Ford launches re-election campaign

Toronto mayor Rob Ford launches re-election campaign

Toronto's controversial Mayor Rob Ford officially launched his campaign for re-election on Thursday night vowing to 'not back down.'

Horseless carriage introduced at NYC auto show

Horseless carriage introduced at NYC auto show

An electric car that proponents hope will replace horse-drawn carriages in New York City has also been revealed at the city’s auto show Thursday.

Appellate court hears Oklahoma gay marriage case

Appellate court hears Oklahoma gay marriage case

Plaintiffs and the defense react to a three-judge appellate panel in Denver that heard oral arguments in a lawsuit that seeks to overturn Oklahoma's ban on same-sex marriage.

Malaysia: Ocean floor images 'very clear'

Malaysia: Ocean floor images 'very clear'

Malaysia's defense minister said on Thursday that images from the underwater vehicle searching for missing flight MH370 were ‘very clear’ but had so far returned no clues.

The latest state to decriminalize pot

The latest state to decriminalize pot

Maryland joined 15 states and the District in changing the punishments for small amounts of marijuana possession. PostTV looks at the state of pot laws across the country.

Chelsea Clinton announces she’s pregnant

Chelsea Clinton announces she’s pregnant

At a Clinton Foundation event, Chelsea Clinton announced she’s expecting her first child. She was at the event with her mother, former secretary of state Hillary Clinton.

Agreement reached to calm Ukraine tensions

Agreement reached to calm Ukraine tensions

Top diplomats from the United States, European Union, Russia and Ukraine reached agreement on immediate steps to ease the crisis in Ukraine.

U.S. sending nonlethal aid to Ukraine military

U.S. sending nonlethal aid to Ukraine military

Defense Secretary Chuck Hagel said the U.S. will send medical supplies, helmets and other nonlethal aid to the Ukrainian military in response to Russia's “destabilizing activities.”

Latest from Post video journalists

Behind the circumcision ritual

Behind the circumcision ritual

Adults attending conversion classes at Sixth and I synagogue learn about the traditions behind the ancient Jewish practice of circumcision.

Google Chromecast at The Washington Post: How you can watch

Google Chromecast at The Washington Post: How you can watch

PostTV has incorporated technology that allows you to play any of our videos on your TV set through the popular Chromecast device. That means you can watch videos and news shows from The Washington Post and control the playback right from your computer, tablet or smartphone.

Property rights and the pipeline

South Dakota rancher John Harter tried to stop TransCanada from securing the right of eminent domain over his land where they want to put part of the proposed Keystone XL pipeline, but Harter recently lost his battle in court.

Brazil swept up by new energy source

Brazil swept up by new energy source

In Northeastern Brazil, energy companies are erecting wind farms to capitalize on the constant winds that have challenged farming families for generations.

Making the most out of your museum visit

Making the most out of your museum visit

The Post's Anne Midgette shares five tips for how to get the most out of your visit to a museum.

Obama slams GOP: 'Do your job'

Obama slams GOP: 'Do your job'

A mashup of highlights from the president's speech on the government shutdown at M. Luis Construction company in Rockville, Md. Thursday.