1.  But computers were taught a two-digit system for dates.

2.  He had been a golf pro at clubs in Florida and New York before teaching himself computer programming.

3.  Mr. Caldwell taught himself computer programming to design software for his company, and soon other agencies wanted to buy it.

4.  Then came Papert and Minsky, two Massachusetts Institute of Technology powerhouses whose work has shaped our understanding of how humans learn and how computers can be taught.