Test your reflexes with the highly addicting MarvinSpectrum, a game that tests your frantic use of the up and down arrows. You've got jumping! Leaping! Running! Diving! And all sorts of fun stuff with ...

Sadly, the CD-ROM self-test for determining seniors' driving reflexes [Dr. Gridlock, March 13] is not compatible with my computer. Do you know if there is a similar program available for Macintosh ...