Elementary Mechanics from a Mathematician's Viewpoint [direct link to large PDF] by Michael Spivak - notes from his eight 2004 lectures (which eventually became a book). See the quote inside to get the flavor of it. [more inside]
Discovering Free Will (Part II, Part III) - a nice discussion of the Conway-Kochen "Free Will Theorem". [more inside]
The Geometry of the Snail Ball [pdf] - an interesting article (with some DIY advice at the end) about a toy shop curiosity you may have encountered.
Physical Review Letters' 50th anniversary retrospective promises to be an interesting survey of the physics landscape for the past half-century.
Symmetry. Shakespeare. Islamic medicine. Creative writing challenges. Four podcast series from University of Warwick.
The scientific tradition in Africa. An interview with Thebe Medupe, a South African astronomer.
The Everything of Theory and other articles by Gates, Roachcock, Kangaroo & Gall. Contains embedded video, not to mention branes and GUTs.
The universe in just two symbols. The rest, as they say, is details. No wonder the "Physics Establishment" is trying to keep this quiet. The author, having conquered the universe in general, tackles poetry, as well.