What is a logical way that you could begin to investigate why your tire had low air pressure? Look to see if there is a hole in the tire.
Feel the tire for air escaping from it.
Place the bike in a warm location to see if the tire pressure increases.
Apply an outside pressure to the tire and listen for air escaping from the tire.
DONE
Intro

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

Ais your answer to this

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck