segmented virus strains genome segment shuffling traits

Two virus strains can mix parts to create new combinations

Some viruses divide their genetic material into separate pieces. If two strains infect the same cell, pieces from both can end up together in new virus particles. The offspring can therefore have combinations of traits that neither parent strain had.

A boat answered wireless commands

In 1898, Nikola Tesla publicly demonstrated a radio-controlled boat, showing that wireless signals could control a vehicle remotely. He called the system a “telautomaton.”

The prehistoric era did not end everywhere at the same time

Prehistory refers to periods before surviving written records, but writing appeared in different regions at very different times. Mesopotamia had written documents thousands of years before some other societies adopted writing. That means one civilization could be recording history while another remained prehistoric. The boundary is about evidence, not a worldwide date.

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segmented virus strains genome segment shuffling traits

Two virus strains can mix parts to create new combinations

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