The brain up close
What real pictures of the brain show, and how their sizes compare.
1 question with something to try
What do these pictures of the brain show?
Three pictures at three scales: a brain, a nerve cell and a synapse side by side, MRI slices through one donor and the branches of one mouse cell.
These pages explore the ideas behind the puzzles. They don’t interpret your levels, your answers or anyone’s health. How to read your results · Sources