Best videos of 2011: Jet-powered levitation, NewScientist

Bizarro-world math: Ornaments that defy geometry, NewScientist

365 days: 2011 in review, Nature

From neutrinos to stem cells: a round-up of the year in research and science policy.

Year in Pictures 2011, http://www.greenpeace.org/international/en/news/Blogs/makingwaves/year-in-pictures-2011/blog/38481/

Video animation: RNA interference, Nature

RNA interference (RNAi) is an important pathway that is used in many different organisms to regulate gene expression. This animation introduces the principles of RNAi involving small interfering RNAs (siRNAs) and microRNAs (miRNAs). We take you on an audio-visual journey through the steps of gene expression and show you an up-to-date view of how RNAi can silence specific mRNAs in the cytoplasm.

New material could create technicolour dreamcoat, NewScientist