Good morning. Changes are needed to redress a heavy imbalance in market power between suppliers and supermarkets in Australia’s heavily concentrated supermarket industry. So says a report ordered by the federal government, to be released today, but its author, the former Labor trade minister Craig Emerson, stops short of calling for powers to break up the big supermarkets. He says heavy penalties would be “a far more credible deterrent to anti-competitive behaviour”.

Meanwhile, an explosion of interest from investors in rooming houses has prompted concerns about vulnerable residents, and Israel has withdrawn troops from southern Gaza.

Shortly after Charles Darwin published his magnum opus, The Origin of Species, in 1859, he started reading a little-known 100-year-old work by a wealthy French aristocrat. Its contents were quite a surprise. “Whole pages [of his book] are laughably like mine,” Darwin wrote to a friend. “It is surprising how candid it makes one to see one’s view in another man’s words.”

Darwin later acknowledged Georges-Louis Leclerc, Comte de Buffon, as one of the “few” people who had understood that species change and evolve, before Darwin himself.

Buffon also put forward the idea that animals were becoming extinct at a time when most natural historians believed that “God would never allow any species to ever disappear or arise over time”, according to Jason Roberts, writer of a new book about the aristocrat. “The concept of species change and extinction was very controversial.”

It’s 50 years since Ernő Rubik unleashed his mesmerising magic cube on the world. But why, despite the growth in digital games, is the Rubik’s Cube as popular as ever? The Observer heads to a two-day British competition in which, with clicks and clacks of sliding plastic, dozens of puzzlers race each other to solve the fiendish squares – some even blindfolded.

The Albanese government will select an experienced military figure as its special adviser on Israel’s killing of seven aid workers, including Australian Zomi Frankcom, The Australian reports. The Herald Sun says police have decried social media platforms for not doing more to curb the posting of youth crime online. The ABC reports on the rise of “financial sovereignty” – Australians who believe they don’t have to pay any tax.

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