There are 64 records in the database
(20 in this table).
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| Type ▲ ▼ | Description ▲ ▼ | Value | Importance ▲ ▼ |
|---|---|---|---|
| Size of an atom | 10-10 meters | ||
| Composition of air (Nitrogen, Oxygen, Argon) | 78, 21, 1 per cent | ||
| Depth of the Mariana Trench | 11 kilometers | ||
| Normal human body temperature | 37 degree Celsius | ||
| Rise of modern humans in africa | 100 - 200 thousand years ago | ||
| Temperature of maximum density for water | 4 degree Celsius | ||
| Typical size of a bacterium | 1 - 5 micrometers | ||
| Altitude of the International Space Station (ISS) | ~ 400 kilometers | ||
| Circumference of the earth | 40 000 kilometers | ||
| Construction of the pyramids at Giza | 2600 - 2500 BC | ||
| Escape velocity on earth | 11 kilometers per second | ||
| Number of chromosome pairs in the human genome | 23 | ||
| Number of planets in the solar system | 8 | ||
| Sun - Earth distance | 150 million kilometers | ||
| Temperature of a candle flame | 1 400 degree Celsius | ||
| Average blood volume of an adult | 5 litres | ||
| Chernobyl disaster | 1986 AD | ||
| First manned moon landing | 1969 AD | ||
| Pulse rate at rest | 60 - 100 beats per minute | ||
| World population | 8 billion people |
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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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