is it duck tape or duct tape ?

http://tapeestry.com/   Met Kevin Richard today, all is made with .. duct tape (in various colors).

So the stuff is said to be no good on ducts.
But seems to be great for other things.

starlings (cranes?)

http://www.24hourmuseum.org.uk/exh_gfx_en/ART37187.html

definition of murmuration http://dictionary.reference.com/browse/murmuration

education - free or __?

Open Courseware at MIT http://ocw.mit.edu provides access to classes, quizzes, video lectures, demos, etc.

But student-taken class notes...   whose property is it ?
http://www.boston.com/bostonglobe/ideas/articles/2009/12/13/freeharvardeducationcom/?page=full

If a professor spends years crafting a teaching method / style / content should she retain control of that rather than permitting it to be posted on youtube, unedited, and of uncertain quality ?

mathematical bagel cutting

http://www.georgehart.com/bagel/bagel.html

after you do the linked rings, make the moebius strip !

thanks, Dan !