On May 13th, 2000, I posted a message exclaiming that Cyan had learned to properly use a mouse.
Today, Xavier did it. I walked into our spare room and there was Xavier surfing some Clifford pages on pbskids.org (I have that site set up as their home page). He was "stuck" (one of his first words) and I told him to click on the red "Back" arrow. He promptly did!
He started mousing 15 days sooner than Cyan did... both on the same RevB Bondi Blue iMac. Way to go Xavier! :-)