There are 64 records in the database
(20 in this table).
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You may up- or downvote records to gauge their relevance.
| Type ▲ ▼ | Description ▲ ▼ | Value | Importance ▲ ▼ |
|---|---|---|---|
| Absolute zero | − 273 degree celsius | ||
| Abundance of Hydrogen in the Milky Way | 74 per cent | ||
| Age of the universe | 13.8 billion years | ||
| Altitude of the International Space Station (ISS) | ~ 400 kilometers | ||
| Assassination of Julius Caesar | 44 BC | ||
| Average blood volume of an adult | 5 litres | ||
| Avogadro constant | ~ 6 ✕ 1023 | ||
| Begin of the construction of the Great Wall of China | ~ 500 BC | ||
| Beginning of the French Revolution | 1789 AD | ||
| Chernobyl disaster | 1986 AD | ||
| Circumference of the earth | 40 000 kilometers | ||
| Composition of air (Nitrogen, Oxygen, Argon) | 78, 21, 1 per cent | ||
| Construction of the pyramids at Giza | 2600 - 2500 BC | ||
| Depth of the Mariana Trench | 11 kilometers | ||
| Diameter of the Milky Way | 100 - 180 thousand light years | ||
| Distance to the horizon for an observer on sea level | ~ 5 kilometers | ||
| Earliest life on earth | 3.5 billion years ago | ||
| Earth's age | 4.6 billion years | ||
| Earth's axial tilt | 23 degree | ||
| End of the Western Roman Empire | 476 AD |
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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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