How do scientists actually measure the calorie content of food? Thanks to the team at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, we bring you the science of a calorimeter.
The BMJ was first published in 1840 as The Provincial Medical Journal. Since then it has published many of the papers which have transformed healthcare. To celebrate the whole archive becoming available online, we commissioned a series of videos to celebrate some of the stories which can be found within it.