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Boston 02/13/19 The National Cannabis Industry Association Seed to Sale covention was held at the Hynes Convention Center. Bottles of CBD tincture from Vermont Pure CBD that were available for purchase there. Photo by John Tlumacki/Globe Staff(metro)

What is CBD? Here’s what you need to know.

The snow plow truck as it was seen passing protestors in Falmouth Monday.

'He knew what we were doing and why we were there'

Jeremy Ullmann

Read the obituary for Jeremy Ullmann, the neuroscientist who died on Mount Washington

BOSTON, MA - 2/22/2019:Green markers for evidence ( shell cashings ). Boston Police shooting on Gerard st in the early am after police pulling over a driver on a traffic stop. Suspect shoot at police officers hitting one without serious inury. Suspect was shoot and found dead on George Street in his vehicle. (David L Ryan/Globe Staff ) SECTION: METRO TOPIC

Boston officer shot, suspect dead after gunfire exchanged during traffic stop in Roxbury February 22, 2019 | 8:19 AM

Mueller report looming, new attorney general in hot seat February 22, 2019 | 12:19 AM

Vacant UN post has new favorite: the US ambassador to Canada February 22, 2019 | 12:12 AM

Alabama woman who joined Islamic State sues to return to US February 21, 2019 | 10:31 PM

White House says US will keep 200 troops in Syria February 21, 2019 | 9:04 PM

Trump pledges to expand opportunity for every race February 21, 2019 | 8:38 PM

Feds: El Chapo's sons indicted on drug conspiracy charges February 21, 2019 | 6:30 PM

A house is destroyed in Lawrence, Mass., Thursday, Sept. 13, 2018 after a series of gas explosions in the area.

Gas explosions cost Columbia Gas more than $1 billion February 21, 2019 | 6:20 PM

Police: Waltham officer injured in accidental gun discharge February 21, 2019 | 6:02 PM

CAMBRIDGE, MA- NOVEMBER 17, 2017- : A Green Line train arrives at Lechmere Station in Cambridge, MA on November 17, 2017. (CRAIG F. WALKER/GLOBE STAFF) section: metro reporter:

Here's the schedule for the Green Line Extension bridge closures — and how to get around them February 21, 2019 | 5:45 PM

US ambassador to Canada emerges as favorite for UN post February 21, 2019 | 5:21 PM

Sen. Elizabeth Warren (D-Mass.) speaks at Springs Preserve in Las Vegas, Feb. 17, 2019. Warren has embraced a new tax policy in her presidential campaign: a tax on family’s wealth above $50 million at 2 percent a year, with an additional surcharge of 1 percent on wealth over $1 billion. (Bridget Bennett/The New York Times)

Elizabeth Warren backs reparations for black Americans, joining Kamala Harris February 21, 2019 | 4:25 PM

The Latest: Judge imposes gag order on Trump confidant Stone February 21, 2019 | 3:48 PM

Trump ally Stone gets gag order after 'crosshairs' post February 21, 2019 | 2:59 PM

Thousands attended the Boston Freedom Rally in 2017.

After complaints, Boston issues permit cutting back on 3-day 'Hempfest' February 21, 2019 | 1:55 PM

Cohen visits Senate offices ahead of congressional testimony February 21, 2019 | 1:44 PM

'I’m basically getting a second chance at life here' February 21, 2019 | 1:01 PM

Sanctions could ease with greatly reduced North Korea threat February 21, 2019 | 12:52 PM

Waiting for final Mueller report? It may be short on detail February 21, 2019 | 12:26 PM

Jussie Smollett staged attack to 'promote his career,' police say February 21, 2019 | 12:06 PM

Lawyer: Ex-FBI official McCabe still facing investigation February 21, 2019 | 11:31 AM

Boston Children’s neuroscientist, 37, dies on Mount Washington February 21, 2019 | 11:16 AM

Michigan mom killed 3 daughters, self with hunting rifle, police say February 21, 2019 | 11:08 AM

Bob Brown/Richmond Times-Dispatch via AP

Judge reverses bail denial for activist who exposed breast outside Virginia Capitol February 21, 2019 | 10:56 AM

Winhall, Vt.

Mass. man dies in Vermont snowmobile crash February 21, 2019 | 10:48 AM

GLENDALE, CA - FEBRUARY 18: U.S. Senator and Democratic presidential candidate Elizabeth Warren (D-MA) speaks at an organizing event on February 18, 2019 in Glendale, California. Warren is attempting to become the Democratic nominee in a crowded 2020 presidential field and is the first candidate to have a public campaign event in the metropolitan area of Los Angeles. (Photo by Mario Tama/Getty Images)

3 issues that Elizabeth Warren says are 'real' national emergencies February 21, 2019 | 10:45 AM

The Latest: High-level US-China trade talks resume February 21, 2019 | 10:22 AM

A photo of Troy Marden from his Go Fund Me page. Marden died from his injuries after a snowmoble crash in Thompson Lake ME on 7/12/19. Credit Go Fund Me

‘His sudden, tragic passing has left a great void in the hearts of all who knew and loved him’ February 21, 2019 | 10:05 AM

Ayanna Pressley

‘I’ve been rockin’ bifocals since 2nd grade’: Here’s why Ayanna Pressley shared a photo of herself wearing glasses February 21, 2019 | 9:34 AM

Intersection of Russell Street and Shawinigan Drive.

2 children killed in 3-vehicle crash in Mass. February 21, 2019 | 9:08 AM