The density of an equal-mass water 1 ethanol mixture is 0.913 g/cc at 20°C. If the density of water is 0.998 g/cm3 and ethanol is 0.789 g/cm3 with both at 20°C, does this equal-mass mixture possess a positive or negative excess volume at 20°C?

Happy new years every one

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later