Lynda Fabian, age 11, of Valparaiso, Ind., for her question:

WHY    DOES THE TOWER OF PISA LEAN?

The famous bell tower in Pisa, Italy, is considered one of the seven wonders of the modern world. Although it has stood for hundreds of years, it leans so far to one side that it looks as though it will fall.

Begun in 1173 and finished in 1372, the ground under the tower started to sink after the first three stories were built. Today, the eight story tower is about 14 feet out of line. Since 1918, the tower has increased its lean by an average of about one millimeter a year. But there is no immediate danger that the tower will topple.

Galileo was said to have made his famous experiments with falling

weights from the top of his 182 foot tower in1589.