# Science Basics O/X
> Everyday facts about the natural world
// Swiq — https://swiq.jiun.dev/set/seed.en.science.science/

Water freezes at 0 degrees Celsius at standard atmospheric pressure. | O | At standard pressure, water turns to ice at 0 degrees Celsius (32 degrees Fahrenheit).
The Sun is a star. | O | The Sun is the star at the center of our Solar System, producing light and heat by nuclear fusion.
Humans breathe in oxygen and breathe out carbon dioxide. | O | In respiration, we take in oxygen and release carbon dioxide as a waste product.
Plants make their own food through photosynthesis. | O | Plants use sunlight, water, and carbon dioxide to make food through photosynthesis.
The chemical formula for water is H2O. | O | Each water molecule is made of two hydrogen atoms and one oxygen atom, written as H2O.
Sound travels slower than light. | O | Light travels far faster (about 300,000 km/s) than sound (about 340 m/s in air).
The Earth is the largest planet in the Solar System. | X | Jupiter is the largest planet; the Earth is much smaller.
A healthy human has two hearts. | X | A human normally has one heart that pumps blood around the body.
The Sun revolves around the Earth. | X | The Earth and other planets orbit the Sun, not the other way around.
Bats are a kind of bird. | X | Bats can fly, but they are mammals that feed milk to their young, not birds.
Diamond is made of gold. | X | Diamond is made of carbon atoms, not gold.
A year on Earth is exactly 100 days long. | X | A year on Earth is about 365 days, the time it takes to orbit the Sun once.