Europe’s financial crisis hits firms in Mass.

Bay State companies that depend on Europe for much of their business are reporting slowing overseas sales as the debt crisis there deepens.

“We have made it clear that we will be zealous and chase any leads.” said US Attorney Carmen M. Ortiz.

Public’s aid sought in ’90 Gardner Museum heist

Federal officials investigating the 1990 art theft plan to launch a public awareness campaign similar to the one that led to the arrest of James ‘‘Whitey’’ Bulger.

One freezer contained about 150 brain samples from people who had died with a neurological or psychiatric condition.

Essdras M Suarez/Globe Staff

Freezer failure at brain bank hampers autism research

A malfunction at Harvard-affiliated McLean Hospital has severely damaged one-third of the world’s largest collection of autism brain samples.

New England’s 6th casino opens in Western Maine

The Oxford Casino, built on former farmland, opened on Route 26 early this month, two years after voters narrowly approved it in a statewide referendum.

The Great Works Dam is among those on the Penobscot River in Maine that will be dismantled.

FRED FIELD FOR THE BOSTON GLOBE

Maine dam removal aims to rescue fish species

A multimillion-dollar project will allow endangered and dwindling species to return to their historic spawning grounds along Maine’s longest river, the Penobscot.

Changes imperil Gulf of Maine’s food chain

Sediment stirred by increased rainfall in New England over recent years is threatening the marine food chain in the Gulf of Maine, scientists said.

Adrian Walker

In search of transparency at Brookline High

Adrian Mims alleges he was passed over as headmaster of the school because he is black, a complaint that has roiled the town, a liberal bastion in the state.

 The Objet 3-D printer can produce a single object containing both hard and soft materials.

A high-tech step forward for prosthetics

David Moinina Sengeh, a PhD student at MIT, is working to create a systematic process that produces comfortable, custom-fit prosthetics every time.

Prisoners at Dachau cheer US troops who liberated the concentration camp in May 1945.

G Cover

Recognizing delayed PTSD in Holocaust survivors

Researchers are finding that the passage of time does not always diminish traumatic symptoms — and old age can actually aggravate them.

Sports

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On basketball

Will Celtics rebuild, or keep Big Three era going?

While the likely end of the Celtics’ run with Paul Pierce, Kevin Garnett, and Ray Allen makes for a heart-wrenching story, it is not a cinch that they are broken up.

Metro

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Once-ailing turtles back in the wild

After several months of rehabilitation at the New England Aquarium, 17 endangered sea turtles were released Sunday evening off the coast of Virginia.

Health and wellness

Daily Dose

How to rewire your brain to be more optimistic

A new book, “Rainy Brain, Sunny Brain,” redefines what optimism is. Try the following four measures to alter your outlook on life.