FMRI has become an industry standard for neuroimaging, and while it’s relatively easy to understand the basics of the BOLD response and how neural activity can effect blood flow, trying to visualize the fundamentals of MRI physics can be really difficult. Luckily, friendly New Zealand company Magritek has produced an incredibly easy to follow and informative series of videos covering the basic physics of magnetic resonance all the way up through 2D MRI. They also make a really neat desktop MRI apparatus that uses the Earth’s magnetic field as its primary field, thus avoiding the need for cryogenics and superconducting magnets.