See a newsletter of the Mathematical Association of America
(MAA) on April 15, 2009. Excerpts, with updated links:

"Michael Starbird's Distinguished Lecture, simply titled
'The Fourth Dimension,' was an example of what is
so wonderful about mathematics: the ability to create
new ideas." 

Read More —
http://www.maa.org/meetings/calendar-events/
the-fourth-dimension

"'Rick's Tricky Six Puzzle: S5 Sits Specially in S6'
by Alex Fink and Richard Guy"

http://www.maa.org/sites/default/files/pdf/pubs/mmapr09.pdf
    
"The recent Mathematics Magazine article comes with
an interactive supplement featured in LOCI." 

Read More —
http://www.maa.org/publications/
periodicals/loci/supplements/
interactive-supplements-to-ricks-tricky-six-puzzle

See as well a related Log24 post of Nov. 5, 2012.