old window glass uneven panes slow flow

Uneven old windows were made that way

Uneven glass in old windows is not evidence that it slowly flowed downward; the irregularities were already present when the panes were made. A study of medieval glass estimated a flow rate of only 1 nanometre per billion years at room temperature.

Cats cannot taste sweetness but strongly taste compounds in tuna

Domestic cats have a genetic change that prevents their sweet-taste receptors from responding normally to sugar. Tuna is different: cats can detect compounds in it that together produce a strong savory, or umami, taste.

Public-key encryption lets you share one key with everyone

Public-key encryption uses a pair of keys. One can be shared with everyone, while the matching private key stays secret. This solved a major problem: two people no longer had to secretly exchange the same key before they could communicate securely.

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old window glass uneven panes slow flow

Uneven old windows were made that way

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