There are 64 records in the database
(20 in this table).
You may up- or downvote records to gauge their relevance.
You may up- or downvote records to gauge their relevance.
| Type ▲ ▼ | Description ▲ ▼ | Value | Importance ▲ ▼ |
|---|---|---|---|
| Height of Earth's atmosphere | 100 kilometers | ||
| Initiation of the Reformation by Martin Luther | 1517 AD | ||
| Invention of the printing press | ~ 1440 AD | ||
| Typical size of a plant/animal cell | 10 - 100 micrometers | ||
| Wavelength of X-rays | ~ 1 nanometer | ||
| Number of species on earth | ~ 10 million | ||
| Pitch standard | 440 herz | ||
| Abundance of Hydrogen in the Milky Way | 74 per cent | ||
| Begin of the construction of the Great Wall of China | ~ 500 BC | ||
| Diameter of the Milky Way | 100 - 180 thousand light years | ||
| Founding of Rome | 753 BC | ||
| Moon-Earth distance | ~ 400 000 kilometres | ||
| Walking speed | 3.6 kilometers per hour | ||
| Assassination of Julius Caesar | 44 BC | ||
| Beginning of the French Revolution | 1789 AD | ||
| End of the Western Roman Empire | 476 AD | ||
| Landing of Columbus in the New World | 1492 AD | ||
| Number of states in the united nations | 193 states | ||
| Speed of raindrops | ~ 8 metres per second | ||
| Length of Amazon River | ~ 6 400 kilometers |
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Not just any numbers: It provides a topically broad list thereof – worth to be memorized, not just as part of general knowledge, but as a benchmark to gauge the world we live in.
These numbers can either be explored one after another in a quiz-like fashion, or accessed in an aggregated, tabular form. In addition, there is a simple voting mechanism that allows visitors to up- and downvote records to rate their importance.
The purpose of numbers2know.org is not to provide a comprehensive list to look up numbers, but to encourage and support people memorizing selected numerical values of general interest.
For more background information click here.
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