The Top Ten Things Science Can't Explain

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10. The WOW! signal
9. Pioneer's Funky Voyage
8. Female Orgasms
7. Dark Energy
6. The Speed of Light
5. The Placebo Effect
4. Cold Fusion
3. Yawning
2. Dark Matter
1. What Came Before, What Will Come After

Yawning has been explained, lazy.
Yawning is caused by lack of oxygen in blood. A healthy morning exercise can cure that right up. If you find yourself about to yawn there are a few steps you can take:

To complete yawn process,
-Cover mouth for politeness when it public, it's about respecting other people's wishes by respecting your own wishes. *how would you like to be eating a great meal with a girl and see this guy yawning and bringing your food. But, being disrespectful is part of the darker side of human nature.

To stop the process,
-Use the under-knuckle of your thumb to rub the vein in your fore-head from between your brows up wards. This will provide more blood flow in the brain and cease a yawning reaction.