Mesopotamia Indus Yellow River independent writing

Writing appears to have arisen separately in three river valleys

The early civilizations of Mesopotamia, the Indus and the Yellow River may have exchanged technologies and ideas, including math and the wheel. Yet writing appears to have developed independently in each, so shared ideas did not require a shared origin.

Ocean tides create tiny magnetic signals

Seawater carries electricity. As ocean tides move this water through Earth's magnetic field, they create tiny magnetic signals of their own. Scientists can measure these signals and use them to learn about heat stored in the ocean.

A vaccine teaches the immune system before the real infection arrives

A vaccine shows the immune system recognizable parts of a germ without requiring the disease itself. Some of the B and T cells that respond remain as memory cells. If the real germ arrives later, the body already has defenses prepared for it.

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Mesopotamia Indus Yellow River independent writing

Writing appears to have arisen separately in three river valleys

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