Domain: Natural Science — Physics
Target concept: Ice melts more quickly on a metal block than on a wooden block.

Video generation prompt: Place identical ice cubes simultaneously on adjacent metal and wooden blocks within the same room, and allow them to remain undisturbed for a period of time until the ice cubes melt.

Evaluation guide:
(i) Target concept: Differential thermal conductivity drives unequal melting rates of identical ice cubes on materials with contrasting conductive properties.
Minimum mechanism: Metal block must be in direct thermal contact with ambient air and support surface; wood block must be thermally insulating relative to metal; no external heating/cooling sources; phase change must proceed solely via conduction through the block interface.
(ii)Storyline: [Frame 0] Two identical opaque white ice cubes contact two adjacent blocks (metal left, wood right) simultaneously; [Mid-sequence] Liquid water appears and accumulates exclusively under metal-block ice, while wood-block ice retains dry surface and sharper geometry; [Final frames] Metal-block ice is significantly reduced in volume with extensive pooled water; wood-block ice remains largely intact with minimal liquid; all events occur from fixed frontal viewpoint, no occlusion, no motion beyond melting-induced deformation and liquid flow.

Manual:
Experimental Procedure
1. Place two identical opaque white ice cubes simultaneously onto two adjacent blocks—one polished metal, one unfinished wood—within the same frame and room.
2. Hold all objects completely still; no disturbance for the full duration.
Observation of Experimental Phenomena
The ice cube on the metal block develops visible liquid water (puddling, glossy surface, volume reduction) sooner and to a greater extent than the ice cube on the wooden block.
Summary of Experimental Principles
Metal conducts heat from the environment more efficiently than wood, transferring thermal energy faster to the ice, accelerating its phase change from solid to liquid.

Prompt Grounding rubric:
level_1: Neither ice cube nor either block is shown; the metal block and the wooden block do not both appear in frame; the setup described in the prompt (two blocks placed next to each other, each holding an ice cube) is entirely absent from the video.
level_2: Only one block type appears (for example only the metal block, with no wooden block in view, or vice versa) or only one ice cube is shown; when both blocks do appear, they are not positioned next to each other (e.g., stacked, far apart, or on separate surfaces); or the two ice cubes are set down one after the other rather than at the same time.
level_3: Two ice cubes of matching size and shape are placed at the same time on two blocks positioned next to each other, all within a single continuous shot; one block has a shiny, uniform metallic surface and the other has a matte, wood-grained surface, so the two materials are clearly distinguishable; both ice cubes and both blocks stay fully in view for the whole clip, with no hand, tool, or other action disturbing them after placement.
level_4: Everything required for score 3 holds, AND the metal block's reflective, evenly gray surface and the wooden block's grained, warm-toned surface are unmistakable at a glance, not just guessable from a vague texture; the two ice cubes look identical to each other at the start (same size, same cube shape, same solid opaque-white appearance) and each sits at a matching spot on its own block, such as both centered near the shared edge.
level_5: Everything required for score 4 holds, AND the two blocks sit directly against each other with no visible gap, and each ice cube touches or nearly touches the shared edge between the blocks; both ice cubes are set down together, essentially at the same moment, with neither one visibly placed noticeably before the other; the camera viewpoint never moves, and both blocks keep their exact starting positions for the entire ~10-second clip, with the ice cubes only changing shape as they melt.

Scientific and Causal Correctness rubric:
level_1: Neither ice cube shows any melting at all; or one melts while the other stays completely solid and dry the whole time; or both ice cubes melt at a rate that looks the same; or an ice cube's solid-to-liquid change is skipped entirely, for instance it simply vanishes or seems to turn into mist instead of forming liquid water.
level_2: Both ice cubes visibly melt, but at a rate that looks the same, so no contrast is visible between them; or the ice cube on the wooden block melts faster and pools more water than the one on the metal block, which is the reversed, physically wrong outcome; or liquid water shows up under only one of the two blocks while the ice sitting on that same block still looks fully solid.
level_3: Both ice cubes visibly turn from solid to liquid, and the ice cube on the metal block shows more meltwater (pooling, wetness, or spreading) and/or a greater loss of volume than the ice cube on the wooden block; both start as solid, opaque cubes and progress toward liquid without odd artifacts such as sublimating edges, cracking, or an unexplained shift in the ice's color.
level_4: Everything required for score 3 holds, AND the gap between the two is unmistakable: the ice on the metal block keeps building up visible pooled water or takes on a glossy wet look, while the ice on the wooden block stays comparatively dry, matte, and closer to its original cube shape; no water visibly crosses over from one block's ice to the other's, and the melting on each side proceeds at a steady pace rather than jumping ahead or freezing mid-way.
level_5: Everything required for score 4 holds, AND the contrast holds up for the whole clip: from the moment liquid first appears, the metal-block ice always has more accumulated meltwater than the wood-block ice; the wood-block ice keeps sharper edges and a mostly dry surface for longer; the gap between the two never reverses direction, even though it may narrow again once the faster-melting ice cube is almost entirely gone.

Spatiotemporal Consistency rubric:
level_1: An ice cube or block appears to teleport, for example an ice cube is suddenly shown already melted with no transition, or a block's position jumps between frames; the room's lighting or the blocks' cast shadows change abruptly with no visible cause; a block or ice cube visibly breaks apart into misaligned or floating pieces; the camera cuts to a different framing; the background changes unexpectedly.
level_2: The blocks stay roughly in place but at some point visibly shift position or rotate with no physical cause; an ice cube visibly jitters or trembles in place for no reason; the room lighting's brightness or the direction of the cast shadows changes partway through the clip; something such as a hand enters the frame and then disappears without ever exiting normally.
level_3: Both blocks stay exactly where they started, with no rotation, sliding, or resizing; the room's lighting and the shadows the blocks cast keep the same brightness and direction from start to finish; nothing enters or leaves the frame unexpectedly; the background stays unchanged; the camera holds one fixed, unmoving frontal view; the only motion visible is the ice softening, sagging, and its meltwater spreading.
level_4: Everything required for score 3 holds, AND the meltwater flows in a smooth, continuous way, with no droplets that stutter, freeze in place, or jump between frames; wherever meltwater is forming, it spreads gradually across the block's surface and keeps a coherent wet boundary rather than appearing in disconnected patches; the meltwater never appears to sink into the wood grain or hover above the metal surface in a physically implausible way.
level_5: Everything required for score 4 holds, AND the whole clip holds together with no dropped or repeated frames anywhere; the ice and block edges stay steady rather than flickering or vibrating in place; wherever meltwater collects, it shows plausible surface behavior, such as beading up on the smoother surface and soaking in unevenly on the more porous one; no ice cube's melting visibly freezes in place or jumps ahead while the rest of the scene keeps moving normally.