For palaeontologists, ancient remains of animals and plants are "time machines", a window into a distant past. This week Horizon Magazine talks to experts investigating the role of climate change in the disappearance of Europe's giant cave bears, the demise of the Neanderthal and how prehistoric animal teeth can reveal crucial information on the physiology, ecology and climate of the day.
While it is tempting to put Covid-19 behind us, the debilitating symptoms of long-Covid are an unwelcome aftermath of the pandemic that continues to baffle doctors. Research funded by the EU is trying to understand the complexities of this condition and why healthy young women seem to be most at risk.
In the bid to reduce consumption of fossil fuels, innovative – and in some cases surprising – solutions are in high demand. Scientists are exploring exciting new ways to produce more sustainable fuels, using unlikely sources such as E coli bacteria and carbon gases emitted by the steel industry. | 
