MEG measures brain activity by recording magnetic fields produced by electrical currents. Current magnetometers use SQUIDs, while SERF magnetometers are being developed. Approximately 50,000 active neurons are needed to generate detectable signals. Brain's magnetic field is weaker than ambient noise, requiring shielding
Einstein's brain was removed within 7.5 hours of his death in 1955. Harvey weighed the brain at 1230g and preserved it in formalin. The brain was divided into 240 blocks and encased in collodion
Migraine is a common neurological disorder characterized by severe headache attacks. Typical symptoms include nausea, vomiting, light sensitivity, and visual field defects. Among people under 50, migraine is the leading cause of disability
Hydrogen cars eliminate fossil fuel emissions and reduce global warming. Hypersonic vehicles travel 4 times faster than sound. Sodium-ion batteries offer potential alternative to lithium-ion batteries
Early experiments suggested blood flow-activity relationship in 1890 by Mosso. Roy and Sherrington demonstrated local blood flow changes in dogs. Kety and Schmidt confirmed brain's regional regulation of blood flow in 1948. FMRI developed in 1990s by Ogawa and Kwong
Human brain weighs about 3 lbs and makes up 2% of body weight. Contains about 86 billion nerve cells (gray matter). Male brains are 10% larger than female brains. Brain triples in size during first year, reaches maturity at 25