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 ▲ ▼ |
|---|---|---|---|
| Speed of raindrops | ~ 8 metres per second | ||
| Walking speed | 3.6 kilometers per hour | ||
| Escape velocity on earth | 11 kilometers per second | ||
| Speed of sound in air | ~ 340 meters per second | ||
| Speed of light | 300 000 kilometers per second | ||
| Rise of modern humans in africa | 100 - 200 thousand years ago | ||
| Period of the moon's orbit | 29.5 days | ||
| Earliest life on earth | 3.5 billion years ago | ||
| Age of the universe | 13.8 billion years | ||
| Time it takes light to travel from Sun to Earth | 8 minutes | ||
| Extinction of the dinosaurs | 66 million years ago | ||
| Earth's age | 4.6 billion years | ||
| Moon-Earth distance | ~ 400 000 kilometres | ||
| Abundance of Hydrogen in the Milky Way | 74 per cent | ||
| Composition of air (Nitrogen, Oxygen, Argon) | 78, 21, 1 per cent | ||
| Avogadro constant | ~ 6 ✕ 1023 | ||
| Number of states in the united nations | 193 states | ||
| Number of species on earth | ~ 10 million | ||
| World population | 8 billion people | ||
| Number of chromosome pairs in the human genome | 23 |
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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.
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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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