Researchers suggest ‘sex-specific strategies’ after analysis of cardiovascular health improvements

Men may need to exercise twice as much as women to achieve the same reduction in coronary heart disease risk, according to researchers, who say healthy living guidelines should take account of the sex differences.

Scientists analysed physical activity records from more than 80,000 people and found that the risk of heart disease fell 30% in women who clocked up 250 minutes of exercise each week. In contrast, men needed to reach 530 minutes, or nearly nine hours, a week to see the same effect.

Scientists warn of ‘insidious risks’ of increasingly popular technology that affirms even harmful behaviour

Turning to AI chatbots for personal advice poses “insidious risks”, according to a study showing the technology consistently affirms a user’s actions and opinions even when harmful.

Scientists said the findings raised urgent concerns over the power of chatbots to distort people’s self-perceptions and make them less willing to patch things up after a row.

Astrophysicist proposes a ‘radically mundane’ theory for why humans have yet to encounter extraterrestrials

For centuries, great thinkers have pondered why, given the hundreds of billions of planets in the galaxy, we have seen no compelling signs of intelligent life beyond Earth.

Now, scientists are mulling an intriguing possibility: if aliens exist, their technology may be only marginally better than ours. And having explored their cosmic neighbourhood for a while, they simply got bored and stopped bothering, making it difficult to detect them.