Domain: Natural Science — Geology & Geophysics
Target concept: Pyroelectric Effect Detection Experiment of Tourmaline (Paper Fragment Adsorption Method)

Video generation prompt: Heat one end of the tourmaline crystal with an alcohol lamp, then immediately bring it close to shredded paper scraps.

Evaluation guide:
(i) Target concept: Pyroelectric charge separation in tourmaline induced by localized heating, resulting in electrostatic attraction of neutral dielectric material.
Minimum mechanism: Tourmaline must possess intrinsic polar symmetry; heating must be spatially asymmetric (one end only); paper scraps must be electrically neutral, dry, and lightweight; ambient humidity must be low enough to prevent charge leakage.
(ii)Storyline: Phase 1 - Static setup: crystal centered, lamp off, paper scraps motionless on surface. Phase 2 - Heating onset: the flame visibly contacts one end of the crystal only, with a visible heat shimmer appearing locally, making clear that just that end is being heated. Phase 3 - Heating cessation: flame withdrawn; crystal retained in frame. Phase 4 - Proximity: crystal translated linearly toward paper scraps without rotation; heated end enters attraction zone. Phase 5 - Response: paper scraps initiate unidirectional lift toward heated end, followed by sustained adhesion - all observed from fixed frontal viewpoint with no occlusion of crystal tip or paper contact zone.

Manual:
Experimental Procedure
1. Hold a natural tourmaline crystal horizontally with tweezers.
2. Heat one end of the crystal steadily with an alcohol lamp flame for ~2 seconds.
3. Immediately remove flame, then bring the heated end close to stationary shredded paper scraps (within 2 cm).
Observation of Experimental Phenomena
Shredded paper scraps lift and adhere selectively to the heated end of the tourmaline crystal; no adhesion occurs at unheated end or elsewhere on crystal.
Summary of Experimental Principles
Tourmaline is a pyroelectric mineral: temperature gradient across its polar axis induces surface electric charge; heated end develops opposite charge to unheated end, attracting neutral dielectric paper scraps via electrostatic induction.

Prompt Grounding rubric:
level_1: No tourmaline crystal, no alcohol lamp, and no shredded paper scraps appear anywhere in the video.
level_2: Only one of the three required objects (crystal, lamp, or paper scraps) is shown, and two of them are never in the frame together; no heating or proximity action ever takes place.
level_3: The tourmaline crystal, lit alcohol lamp, and shredded paper scraps are all shown; the flame is applied to one end of the crystal, and the crystal is separately brought near the paper scraps - but the order is wrong (e.g., proximity happens before heating) or the crystal and paper scraps are never shown together in the same frame during the proximity step.
level_4: All three objects are clearly shown; the flame is applied to one end of the crystal first, and immediately afterward the same crystal is brought into frame with the paper scraps; both steps happen in one continuous, fixed-viewpoint shot with no object suddenly appearing in a new place.
level_5: Everything required for a 4 is met, and in addition: the crystal is held steadily with no shaking or rotation that obscures which end was heated; the flame stays lit and visibly touches only one end of the crystal, never the middle or the far end; and the paper scraps stay still on a flat surface until the crystal is brought close - all within one unbroken shot with no cuts or overlays.

Scientific and Causal Correctness rubric:
level_1: No paper-scrap response is shown at all - the scraps never move or react to the crystal, and there is no visible heat shimmer near the heated end or any other sign that the crystal was heated only at one end (e.g., the flame appears to touch the whole crystal, or nothing happens after heating).
level_2: The paper scraps move, but not in a way consistent with electrostatic attraction - e.g., they fly up violently, scatter sideways with no bias toward the crystal, or start moving before the crystal is even brought close; or the flame is shown touching the crystal's middle or both ends, or no heat shimmer is visible near the contact point, rather than showing clearly localized heating at just one end.
level_3: The paper scraps move toward the heated end of the crystal specifically (not a random drift), and this motion starts only after the flame has touched one end - with a heat shimmer visible only at that end - and the crystal is brought close to the scraps - but the attraction looks weak or inconsistent, e.g., some scraps lift briefly and fall back off, or the response is patchy rather than a clear pull toward that one end.
level_4: The paper scraps consistently lift up and stick to the heated end of the crystal once it is brought near, and none of them move before the heating step or during the lamp-only phase; the flame is clearly shown touching only one end of the crystal, never the middle or the far end, with a heat shimmer visible only at that end; the scraps' motion is directed toward the heated end and holds steady while the crystal stays nearby, with no sign of scraps being blown by air currents instead.
level_5: Everything required for a 4 is met, and in addition: every paper scrap that comes within reach of the heated end ends up sticking to it, rather than lifting partway and falling back; the heat shimmer stays confined strictly to the heated end without spreading along the crystal's length; the scraps stay stuck to the crystal for a noticeably sustained period once the crystal is held near them, not just an instant; and there is no sign of scraps being disturbed by air currents or vibration rather than by the crystal's own attraction.

Spatiotemporal Consistency rubric:
level_1: The crystal's position suddenly jumps between frames; the lamp's flame disappears and reappears with no continuous burn; the paper scraps vanish and reappear in a different spot; or the lighting or shadows change abruptly in a way that has nothing to do with the flame's position.
level_2: The crystal rotates sharply off-axis between the heating and proximity actions, breaking the sense of one continuous take; the flame flickers unnaturally as if strobing; the paper scraps shift position with no visible cause between the heating phase and the proximity phase; or background details (like the tabletop's color or texture) noticeably change partway through.
level_3: The camera shows slight jitter during the proximity phase; the crystal's tip or the paper scraps are very briefly and barely blocked from view at a key moment before becoming visible again; or the crystal's shadow looks slightly off from where the flame actually is - but overall, the crystal, flame, and scraps all keep a consistent size, orientation, and relative position throughout.
level_4: The crystal, flame, and paper scraps all keep a stable size, position, and orientation throughout; shadows visibly originate from the flame's location and shift naturally as the crystal moves; the overall lighting color and brightness stay constant with no unexplained shift; and nothing outside the heated tip visibly warps, stretches, or distorts in perspective - a brief, localized heat-shimmer haze right at the heated end during the heating phase is expected and is not counted as a distortion.
level_5: Everything required for a 4 is met, and in addition: the camera viewpoint never pans, tilts, or zooms; the crystal's movement toward the paper scraps is smooth and steady rather than jerky or hesitant; the paper scraps lift with a natural sense of weight rather than snapping instantly into motion; and the lamp's flame keeps a steady height and shape rather than flickering or changing form.