13 things that do not make sense - space - 19 March 2005 - New Scientist Space

1. Placebo
2. Horizon Problem: inflation
3. Ultra High Energy Cosmic Rays
4. Madeleine Ennis Belfast Homeopathy: fluke
5. Dark Matter: WIMP
6. Viking's Methane: fluke. Why wasn't this reattempted on Mars rovers?
7. Tetraneutrons: fluke.
8. Pioneer probe drift: unidentified propellant.
9. Dark Energy
10. Kuiper cliff: there's a planet there.
11. Wow signal: fluke
12. alpha is changing: measurement error
13. Cold Fusion: nope

Placebo, dark energy, and cosmic rays are truly interesting problems. I'd add sonoluminescence in there.