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Science by the Numbers
No options, no safety net, just your gut against the real figures. Twenty estimates from the speed of light to the air you are breathing.
🔬 Science
hard
20 questions
~7 min
What this quiz asks
- How fast does light travel through a vacuum?
- Roughly how hot is the Sun's visible surface?
- What is the average distance from Earth to the Sun?
- Roughly how fast does the Earth travel along its orbit around the Sun, in km/h?
- How far is it all the way around Earth's equator?
- How many chemical elements have confirmed names on the periodic table?
- What percentage of dry air is nitrogen?
- How many minutes does sunlight take to reach Earth?
- How many bones are there in the adult human skeleton?
- What is absolute zero, in degrees Celsius?
- How many chromosomes does a typical human body cell carry?
- What percentage of Earth's surface is covered by ocean?
- How many teeth does a typical adult human have, wisdom teeth included?
- How fast does sound travel through air at 20 °C?
- What is the pH of pure water at 25 °C?
- How many litres of blood does an average adult body hold?
- How old is the Earth, in billions of years?
- How old is the universe, in billions of years?
- What is the acceleration due to gravity at Earth's surface?
- At what temperature does liquid nitrogen boil, in degrees Celsius?