In the 1970s, a plethora of Christian rockers, schools projects and eccentrics decided to release their own albums. A new book has collected together a selection of their cover designs – see our selection in all its glory 

Photographs: Sinecure Books 2013/Courtesy Enjoy the Experience

Femen’s aims are straightforward, broad and radical. A war on patriarchy on three fronts, calling for an end to all religions, dictatorships and the sex industry. The group has been offered a space in a rundown theatre in Paris as headquarters, and it is here I meet Inna, 24, at the start of a training session with 20 young Femen activists. She is giving instructions on the correct stance – feet apart, firmly rooted, aggressive. Femen warriors never smile, she says, they are not there to please anyone. The group has been protesting topless since 2010, using their bodies to attract attention, to lure journalists, and they have been roundly criticised by some people, who accuse them of playing into sexist stereotypes. Read more

Photo: KENZO TRIBOUILLARD/AFP/Getty Images

What causes sinkholes?

It’s the stuff of nightmares: last week, the ground opened up and swallowed a Florida man as he lay sleeping in his home. But why do these sinkholes occur and how widespread are they?

Photos: 1. Three buildings collapsed after a huge hole appeared in, Guangzhou, Guangdong province, China on 28 Jan 2013. There are no casualties from the incident, which was near a metro tunnel construction site. Imaginechina/Rex Features. 2. Guatemala city, 2007 Photograph: Ulises Rodriguez/EPA/Corbis

The Hitler home movies: how Eva Braun documented the dictator’s private life

Sharp focus: Eva Braun, Hitler’s lover, whom he married the day before their suicide, at his fortified chalet, Berchtesgaden, in the Bavarian Alps. Photograph: Getty Images

Matchy-matchy couples, by George Maas

Yes Tumblr  it’s a whole gallery of people wearing the same outfit as their partner, at the same time - oh dear god.

Photographs: George Maas

"You have to plan for it, schedule it – consciously make a time and a place for it to happen: "We thought having to pay all that attention to it would somehow distract from it, make it mundane. But it didn’t. The other thing that year made me realise was that men don’t need it more than women. Men might want it for different reasons. But I learned that I wanted it too.

The fact is, Charla says: “Everything just gets better when sex is a vital part of your relationship. He’s happier, you’re happier, the whole house is happier. A daily kindness enters your relationship, a level of attentiveness for each other. It’s almost like you’re dating again … That’s a real discovery.”

Jon Henley catches up with two couples who tried regimes of consecutive sex, for 101 and 365 days respectively. Five years on, are they still, um, at it?

Nobody likes to queue. It’s long been known that, in fancy restaurants, a handsome tip to the maître d’ can shorten the wait on a busy night. Such tips are quasi-bribes and handled discreetly. No sign in the window announces immediate seating for slipping the host a bank note. But in recent years, selling the right to jump the queue has come out of the shadows and become a familiar practice.

We are moving towards a world where everything is up for sale, from standing in line to the right to pollute – and that’s bad for all of us, says Michael Sandel in this extract from his new book, What Money Can’t Buy

A three-sheet for the 1933 monster movie King Kong in what is known as the “Style A” design, which sold for $244,500 in 1999. This for comparison, is the "Style B" three sheet Photograph: Everett Collection / Rex Features

See the 10 most expensive film posters