Timeline of dating history

An age test was performed, but the library in Milan (belonging to the Vatican) conceals its negative outcome, see Comte de Sicrac is credited with building the "celerifer" - purportedly a hobby horse with two wheels instead of a rocker. ) of Marseille obtained an import price for a four-wheeled speed coach called celerifer in 1817.

The timeline lists events in the external environment that have influenced events in human history.

Sea levels rose dramatically (and are continuing to do so), land that was depressed by glaciers began lifting up again, forests and deserts expanded, and the climate gradually became more modern.

In the process of warming up, the planet saw several "cold snaps" and "warm snaps", such as the Older Dryas and the Holocene climatic optimum, as well as heavier precipitation.

Our hope is this comprehensive reference will aid in disaster preparedness and threat-mitigation education.

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Experts consider the sketches a hoax: Further examination of the drawings indicates these are not by da Vinci's hand.

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