值得注意的是，内存配置上iPad Air反而占据“中间档”。根据苹果的规格列表，新款iPad Air配备了12GB统一内存，而M4 iPad Pro则分为8GB（低容量机型）和16GB（高容量机型）两档，iPad Air正好位于两者之间。除核心数量不同外，M4在iPad Air和iPad Pro上的其他关键特性保持一致，包括16核神经网络引擎、支持硬件加速光线追踪、120GB/s内存带宽以及可处理8K视频的媒体引擎等。
Tens of millions of items of clothing are thrown away each year, and the synthetic materials often used by fast fashion retailers are among the hardest to recycle.
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But agar’s superior qualities come with complex chemistry. “To speak of agar as a single substance of certain (if known) chemical structure is probably a mistake,” wrote phycologist Harold Humm in a 1947 article. According to the Food and Agriculture Organization of the United Nations, agar is merely recognized as “a hydrophilic colloid extracted from certain seaweeds of the Rhodophyceae class.” In terms of its actual composition, agar is mostly a combination of two polysaccharides, agaropectin and agarose, which themselves are complex and poorly-characterized polysaccharides made mostly (but not exclusively) from the simple sugar galactose.8