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Card 984 of 9902026-09-17 issue

Observed arrival · 2026-09-17

慢球实验室 · 缓降轨道探索

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Editorial interest 84/100 Selection signal · not a rating of the site

An interactive browser laboratory for comparing slow-ball tracks, obstacles, loops, and moving structures through adjustable physics simulations.

Landing page captured for the 2026-09-17 issue.

Field notes

The laboratory compares 13 track structures, including long sloped tracks, obstacle routes, looping paths, and moving mechanisms. Users can run a simplified estimate or a browser-based three-dimensional contact calculation, alter parameters, replay trajectories, and add runs to a comparison record. Its model notes specify a 4 cm, 2.7 g ball, a 0.5 ms default calculation interval, and 63 checkpoints for the serpentine and Hilbert layouts. The page distinguishes these adjustable calculations from a separate historical MuJoCo multilayer study and warns that the current model is not physically calibrated.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use

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Landing page observed 2026-09-17. The live site may have changed.