03
Why does science not find them?
Because two different claims get mixed together. One is anatomical: that structures sit in the body at these points, that instruments ought to detect them, that a scan could show a blocked one. Nothing supports that. Dissection finds nerve plexuses and glands near some of the locations, which is a resemblance of geography, not a match of things. The other claim is about experience: that attention held low in the belly or in the hollow of the throat produces a reliable, describable state. That one is testable in the ordinary way, by doing it, and for a lot of people it holds up. Keeping the two claims apart is what makes the subject discussable without embarrassment.
04
What are the seven and what is each about?
Counting from the base of the spine upward. Muladhara at the perineum holds safety, money, belonging, the sense of having ground. Svadhisthana below the navel holds appetite, sex, pleasure and creative pull. Manipura at the solar plexus holds will, agency and the nerve to act. Anahata at the heart holds affection, grief and the ability to stay open after being hurt. Vishuddha at the throat holds speech, saying the true thing, being heard. Ajna between the brows holds clear seeing, intuition and judgement. Sahasrara at the crown holds the sense of belonging to something larger than your own case. Read the list as themes for attention, not as switches with positions.