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Atoms are 99.99999% empty space. If you removed the empty space from every human on Earth, the entire species would fit inside a single sugar cube.
Light takes time to travel. The sunlight hitting your face is 8 minutes old. Look at the night sky, and you are literally looking deep into the past.
Beneath the forest floor lies the "Wood Wide Web". Fungi connect the roots of trees, creating a massive underground system to share nutrients and data.
You have 60,000 miles of blood vessels in your body. If you laid them end to end, they would circle the Earth more than twice.
Quantum entanglement allows particles to connect instantly across the universe. If you change one, the other changes immediately, faster than the speed of light.
The sun is a continuous nuclear explosion. If space weren't a vacuum, the sun would be as loud as a police siren constantly blaring in your ears, 93 million miles away.
Gravity slows down time. Because your feet are closer to the Earth's center of gravity than your head, your head is aging slightly faster than your feet.
Sharks are older than the rings of Saturn, and they are older than trees. Sharks have existed for 400 million years; trees only appeared 350 million years ago.