Why is there a difference between sodium and potassium in the reactivity with water

Potassium reacts more vigorously because once it hits water it produces an iron called alkaline. Hydrogen is a release that causes big flames.

Sodium made a little flame and a little bit of a fizzing sound.
Potassium produced a purple flame as it is more reactive as well as sound and smoke came out.
Both of these group 1 metals let out hydrogen as they where in the water so if you put a universal indicator inside the water will turn blue/green/purple so that's y they are called Alkali metals.

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

Less stable  hope this