Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs. This week: we discuss the spread of mpox, formerly known as monkeypox, after the WHO declares a public health emergency of international concern. How a laser has unlocked the secret of the origin of Stonehenge's famous altar stone, and why researchers think horses might be cleverer than we've previously given them credit for. Plus our summer series of Titans of Science concludes with circadian rhythm Russell Foster, who has helped to transform our knowledge of the body's internal clock, and he reckons he's got a cure for jet lag.