How Inca stone walls survived earthquakes

Tightly fitted stones helped Inca buildings survive earthquakes

Inca builders shaped stone blocks very carefully and fitted them together without mortar. The tight fit and slightly hollowed bottoms helped the buildings stay unusually stable during earthquakes and volcanic activity.

Dragonfish hunt with red light most deep-sea animals cannot see

Some deep-sea dragonfish make red light and can see it. Most other animals in the deep ocean cannot because natural red light disappears near the surface. The fish can therefore light up red prey without making the scene visible to many nearby animals.

Navigation satellites also provide precise timing

Global navigation satellite systems provide location, but their precise timing signals have other uses. Telecommunications networks use them to stay synchronized, and scientists use them as a reference in earthquake studies.

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How Inca stone walls survived earthquakes

Tightly fitted stones helped Inca buildings survive earthquakes

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