A 1.0 L balloon at 30°C contains 0.030 mol hydrogen gas and 0.010 mol helium gas. What is the total pressure of the balloon if the partial pressure of helium is 0.25 atm?

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

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