How ravens hide food from unseen rivals

Ravens may hide food based on what another raven can see

Ravens protect hidden food when a stronger rival can watch them. They also protect it when they can hear the rival nearby through a small opening but cannot see it directly. This suggests they may keep track of what another raven is able to see.

Some early televisions were designed for faces, not movies

Early television inventors imagined different uses for moving pictures. Systems intended for personal communication sometimes used tall, portrait-shaped images that framed a single face. As television became a mass entertainment medium, wider formats suited to scenes and groups became more practical. The shape of a screen reflects what its designers expect people to watch.

Century eggs are preserved by making them strongly alkaline

Century eggs are kept in an alkaline mixture that raises their pH. The high pH preserves the egg and breaks some proteins and fats into smaller compounds, producing its unusual texture, color, and flavor.

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How ravens hide food from unseen rivals

Ravens may hide food based on what another raven can see

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