Scientists and “friends of science” are participating in the March for Science on the grounds of the National Mall.

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Meet the kids who are suing the Trump administration on climate change

On April 22, seven of the 21 kids who are suing the federal government for failing to address climate change attended the March for Science in Washington, D.C.

Scientists protest from coast to coast

Thousands of people marched in cities across the U.S. for a collective 'March for Science', standing up to what organizers say is a growing disregard for evidence-based knowledge in Washington.

Trump awards Purple Heart

President Trump awarded a Purple Heart to Army Sgt. 1st Class Alvaro Barrientos on April 22 at Walter Reed Military Medical Center. Barrientos was wounded last month in Afghanistan and lost part of his right leg.

Astronaut Anousha Ansari spoke at the March for Science

Astronaut Anousha Ansari, an Iranian-American engineer, spoke at the March for Science in Washington, saying science is universal and does not discriminate.

Lawyer suing Trump administration speaks at March for Science

Julia Olson, executive director and chief legal counsel, Our Children's Trust, represents the group suing the Trump administration and the fossil fuel industry. She spoke at the March for Science in Washington on April 22, saying "climate science will get its day in court."

Derek Muller speaking at March for Science: 'Science is inherently political.'

Derek Muller, the creator of the Veritasium, a popular science YouTube channel, said there's no removing politics and policy from science at the March for Science in D.C. Muller is a co-host of the march.

Jeff Sessions takes steps to strip 'sanctuary cities' of funding

Attorney General Jeff Sessions says he sent letters to nine 'sanctuary cities' to provide proof that they are communicating with federal authorities about undocumented immigrants or they will risk losing grant funding on April 21.

Congress toes shutdown deadline yet again

With less than a week to pass a new spending bill, negotiations between the White House, Republicans and Democrats are ramping up to avoid a government shutdown on April 29.

Trump signs three executive orders on taxes and Wall Street regulation

President Trump signed three executive orders on April 21 at the Treasury Department which are meant to spark reviews of tax and financial regulations.

Trump says new financial strategy will help women entrepreneurs

President Trump said new tax and financial regulations would help women entrepreneurs during a speech at the Treasury Department on April 21. Trump signed three executive actions to review tax regulations and to roll back Dodd-Frank.

'Think what we can accomplish in the first 100 days': Trump, over and over again

President Trump repeatedly emphasized the importance of the first 100 days of his potential presidency while on the campaign trail. All of these clips were filmed between Oct. 24 and Nov. 6, 2016.

Trump greets freed Egyptian American prisoner

President Trump met with Aya Hijazi on April 21, an Egyptian American charity worker who was imprisoned in Cairo for three years.

Berkeley keeps erupting in protests

Here's a look at some of the protests in the Berkeley, Calif., area in recent months.

Trump outlines policy plans for first 100 days before taking office

President Trump discussed his plan for his first 100 days in office on Nov. 21, 2016.

The DNC chair has been swearing a lot lately

Democratic National Committee Chair Tom Perez and Sen. Bernie Sanders (I-Vt.) are holding a week-long series of rallies across the U.S., and Perez has some choice words for Republican leaders.

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.