A researcher in Brazil has found that the number of neurons a human brain contains is not 100 billion as previously thought.
Humans actually have 86 billion - according to neuroscientist Suzana Herculano-Houzel, the Daily Mail reported Friday.
She found out the true figure in a rather grisly manner - by turning four brains into "brain soup" and counting the number of cell nuclei belonging to neurons.
Herculano-Houzel told Nature: "We found that on average the human brain has 86 billion neurons. And not one that we looked at so far has the 100 billion."