Physics
What you touch is not what you think
Guide: the Hummingbird · 2 wonders
Wonders of Physics
Physics
Is it true you've never touched anything?
Atoms are 99.99% empty space. What you feel as 'touching' is the electromagnetic repulsion between the electrons of two surfaces, which never actually meet. Technically, you've never touched anything.
Read the wonder → PhysicsCan gravity be negative?
Gravity isn't a force but an acceleration (9.8 m/s²); to Einstein it's the curvature of spacetime. And dark energy acts like a repulsive gravity that speeds up the expansion of the universe — the closest thing to 'negative gravity,' and it makes up 68% of the cosmos.
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