When Alice falls down the rabbit hole, she discovers a wonderful world of mathematics: Pascal's triangle, sequences of rabbit generations, and beautiful, never-ending fractals.

The different units used to measure metric length are described, with comparisons to real world objects. A wonderful number line also shows the relative sizes of things all the way from a quark to the universe in powers of ten.

This NPR Morning Edition profile features text and sound to celebrate the life and work of soul singer Sam Cooke whose string of hits includes "Cupid," "Wonderful World," "Chain Gang," and "Twistin' the Night Away."

This NPR Morning Edition profile features text and sound to celebrate the life and work of soul singer Sam Cooke whose string of hits includes "Cupid," "Wonderful World," "Chain Gang," and "Twistin' the Night Away."