Programming 2D sheets to form 3D shapes is significant for flexible electronics, soft robots, and biomedical devices. Stress regulation is one of the most used methods, during which external force is usually needed to keep the stress, leading to complex processing setups. Here, by introducing dynamic diselenide bonds into shape‐memory materials, unconstrained shape programming with light is achieved. The material could hold and release internal stress by themselves through the shape‐memory effect, simplifying programming setups. The fixed stress could be relaxed by light to form stress gradients, leading to out‐of‐plane deformations through asymmetric contractions. Benefiting from the variability of light irradiation, complex 3D configurations can be obtained conveniently from 2D polymer sheets. Besides, remotely controlled “4D assembly” and actuation, including object transportation and self‐lifting, can be achieved by sequential deformation. Taking advantage of the high spatial resolution of light, this material can also produce 3D microscopic patterns. The light‐induced stress gradients significantly simplify 3D shape programming procedures with improved resolution and complexity and have great potential in soft robots, smart actuators, and anti‐counterfeiting techniques.

Modern Olympics have increasingly benefited from the advancement of materials science. From February 4 to March 13, 2022, the whole world has witnessed spectacular Olympic Winter Games and Winter Paralympic Games held in Beijing, during which nanotechnologies are extensively applied and play indispensable roles in many aspects. Although these nanotechnologies appear in a very small length scale, they have provided tremendous support to all athletes with the pursuit of “faster, higher, stronger”. In this Article, we highlight several representative nanotechnologies applied in the Olympic and Paralympic Winter Games including nanoscience in ice skating, wearable monitoring devices, skiing sports equipment, winter protection, and Olympic printing and discuss their physicochemical principles, unique significance for athletes and sports.

Regulating the reactivity and equilibrium of a dynamic reaction is essential for adaptive chemistry and functional materials. Herein, cucurbituril‐based host‐guest interaction was embedded into the dynamic metathesis between diselenide and ditelluride to establish an equilibrium‐adaptive system. In this system, cucurbit[6]uril (CB[6]) selectively bound with diselenide while cucurbit[7]uril (CB[7]) bound with not only diselenide but also ditelluride and exchange product. The dynamic nature of diselenide bond was locked after forming the inclusion complex with CB[6]. Based on this selective locking effect, the Se−Te products were reversed back to diselenide and ditelluride reactants, which was an equilibrium regulating process. Therefore, by combining CB[6]‐based host‐guest interaction and dynamic diselenide chemistry, the reactivity of diselenide bond and the equilibrium of Se−Te metathesis was successfully regulated.

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