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But even short-term exposure to PM 2.5 can lead to adverse health outcomes such as higher rates of infant mortality, increased cardiovascular issues and childhood asthma.

"Philip had a rather tragic and lonely childhood," said historian and Philip's biographer Prof Angela John, who acted as an informal consultant on the film.

The two had been talking about the childhood cement-truck accident that dramatically disabled the actor when he was 11.

When Lennon presented McCartney with “Strawberry Fields Forever,” a woozy reverie loosely based on his childhood, McCartney wrote his own memory piece, “Penny Lane.”

But it's a particularly delicate experience for queer people, who often spend a fair share of their childhood and adolescence conforming to the rigid norms of their surroundings.