Correction
January 22, 2002
The Jan. 15 Kidspace ("Round is all around," page 18) contained an unintended mystery: Why were clues 4 and 6 the same? Here's what No. 6 should have said: "They were used purely as decoration for thousands of years, until someone in 13th-century Europe matched one with a slit - and a revolutionary clothing fastener was born."