The thikness of an eye lash is 15 mm how much this will be in meters ? write it in scientific Notation. Distance between Los Angeles and Mexico City is 2491 kilometers (1548 miles).
Write those 2 numbers into scientific Notation

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