1. Yawning - - - We yawn when we are tired or bored. But exact reason is still not known.
Yawning is contagious but mechanism behind this, is not clear.
2. Dark matter - - - Unlike regular matter, dark matter don't emit or reflect light. Despite its invisibility, its existence is inferred from gravitational effects.
3. Placebo effect - - - Placebo effect occurs when a person's health improves after taking dummy treatment. How to this works, still not understood by scientists.
4. CAT purring - - - Cats purr by vibrating their muscles of larynx. Reason behind this behaviour is still under debate.
5. Gravity - - - All these times, gravity is understood by it's effects and force. Fundamentally it is not understood.
6. Tomato genes - - - Surprisingly, tomatoes have more genes than humans !!! The reason is still a mystery.
7. Slippery ice - - - Why ice is slippery compared to other materials is still not known.
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