An article from Newscientist.com on 13 things that do not make sense for the scientists, i.e., 13 things for which science do not have a explanation yet.
1. The Placebo effect
2. The horizon problem
3. Ultra-energetic cosmic rays
4. Belfast homeopathy results
5. Dark Matter
6. Viking's Methane
7. Tetraneutrons
8. The pioneer anomaly
9. Dark Energy
10. The Kuiper cliff
11. The WoW signal
12. Not-so-constant constants
13. Cold fusion
Experimenting with the Placebo effect, a scientist Fabrizio Benedetti of the University of Turin in Italy, states that "the mind can affect the body's biochemistry"
Check this link to find out more
