It’s a special day for ‘Space or Brain’ because one of my friends contributed this image! Now, I have friends who study brains, and others who study space. That’s just how I roll. But what kind of friend gave me this – a brain or space nerd? I mean, it could be calcium imaging in neuropil. Or a close-up of an fMRI image. On the other hand, it could be some crazy space thing like dark matter (not to be confused with white or grey matter, which is a crazy brain thing).

Here’s the answer of the day!