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Greater Boston author readings Sept. 23-29

A weekly calendar of literary events.

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They’re angry, they’re from Canada, and they’re threatening the coastal ecosystem

Canadians are known as friendly folks, but a new variety of green crab from Nova Scotia doesn’t play nice.

First private moon flight passenger to invite creative guests

Japanese billionaire Yusaku Maezawa said he plans to invite six to eight artists, architects, designers and other creative people to join him on board the SpaceX rocket.

SpaceX says Japanese billionaire will be passenger on first moon voyage

Yusaku Maezawa said it’s been his lifelong dream to go into space.

A different kind of climate summit comes to San Francisco

A smattering of celebrities such as musician Dave Matthews and actor Alec Baldwin will add a touch of red carpet feel to the summit, which starts Wednesday.

Study: 28.5 percent of the time doctors don’t write down why they’re prescribing opioids

Researchers who examined hundreds of millions of records of doctor visits in which people were prescribed opioids have found a major gap: 28.5 percent of the time, there is no reason listed for the prescriptions.

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//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/12/17/BostonGlobe.com/Metro/Images/a4a68392593311e3a80a0a154a02c3a8_7-7210--90x90.jpg Boston Globe Instagram photos

A live stream of Instagram posts from The Boston Globe photo department.