Linkage for the end of June

I know, it's already July; I forgot that June only has 30 days.

• Spiral galaxies, my latest puzzle addiction (G+)

• An endangered species of mathematical chalk (G+)

• Mathematical art/music project in Stuttgart

• 3d-printed fractal bridge in Amsterdam (G+)

• Freedom to take and use photographs in public places in Europe endangered by newly proposed EU law (G+)

• Touch-sensitive kinetic origami (G+)

• Video about 3d immersions of the Klein bottle (G+)

• IEEE clears away some of its junk publications

• Why curiosity-driven basic research is important (and should continue to get government funding), by mathematician and biologist Eric Lander

• Curves good, or angles bad? (G+)