The Hoover Dam, in the Black Canyon of the Colorado river on the border between Arizona and Nevada, impounds Lake Mead, the largest reservoir in the US by volume. More from Eyewitness » 

Photograph: Joe Klamar/AFP/Getty Images

“When you call a rape anything but rape, you are just making excuses for rapists”
— "From college campuses to Game of Thrones, why the sudden urge to re-name sexual assault?" asks Jessica Valenti » 

"The World Cup and Olympics threaten to overwhelm Rio – yet there is time to create a sensation out of disaster," writes Simon Jenkins »

Photograph: Buda Mendes/Getty Images

Ukraine: government troops move against pro-Russian separatists - live updates

• Ukrainian troops move into Slavyansk and Donetsk.
• Obama warns of new sanctions.
• Russia says Geneva deal ‘to be implemented in practical steps.

Follow live updates »

The Double Down sandwich from KFC is back: ‘This is meat personified’ 

KFC relaunched its controversial sandwich on Monday, four years after the nation’s arteries were first subjected to the infamous fried chicken and bacon and cheese concoction. Read more »

“The female ‘confidence gap’ is a sham”
— Women’s lack of confidence could be just a keen understanding of just how little society values them, writes Jessica Valenti 

The world’s best animal architecture - in pictures

Australian weaver ants building their nest by pulling on leaves and working in chains, in Northern Territory, Australia. The adult builders pull leaves together with their pincers then interweave them with silk threads produced by their larvae. They can build an entire nest in 24 hours. Photograph: Ingo Arndt

The artist who lays eggs with her vagina – or why performance art is so silly

Performance artist Milo Moiré creates abstract paintings by pushing eggs filled with paint and ink out of her vaginal canal. She does this while standing naked in front of an audience. The nudity, apparently, is artistically essential. As for the act of pushing paint-filled eggs out of her body, it is – as no doubt you perceive – a powerful feminist statement about women, fertility and creativity. 

Jonathan Jones.

Ukraine’s acting president calls for action against pro-Russian separatists

Ukraine’s acting president has called for the resumption of military operations against pro-Russian separatists in the east of the country, claiming two of his party’s supporters had been “tortured to death”, in a further blow to an unravelling international peace plan.

Oleksandr Turchynov said “counter-terrorist” operations in the region, suspended as part of the peace agreement in Geneva last Thursday, should restart after the bodies of two men, one a pro-Kiev politician, had been found near the rebel-held town of Slavyansk. Full story

Photograph: Itar-Tas/Barcroft Media

Tony Blair to say battle against Islamic extremism is paramount

The former prime minister will warn the west it needs to take sides in the Middle East and move the battle against Islamist extremism to the top of the political agenda.

In a speech to Bloomberg in London on Wednesday, he will say:

The important point for western opinion is that this is a struggle with two sides. So when we look at the Middle East and beyond it to Pakistan or Iran and elsewhere, it isn’t just a vast unfathomable mess with no end in sight and no one worthy of our support. It is in fact a struggle in which our own strategic interests are intimately involved; where there are indeed people we should support and who, ironically, are probably in the majority if only that majority were mobilised, organised and helped.

Full story | Live reaction to Tony Blair’s speech

Photograph: Matt Rourke/AP