For all those with aces up your sleeves, today is your chance to show you know which end of a Jack is up. From noon to 6 p.m., the Student Recreation Center is holding an all-day, doubles team, double-elimination spades tournament. The entry fee is $5 per team, so bring your card-shark selves to the Intramural Sports Office, Room 218. For more information, contact Monte Reed at 621-8723.

Do you suffer from cramps or spasms in your back? Do you wake up feeling like you slept in a Pop Tarts box? Stop by the Arizona Health Sciences Center, Room 2823, in the University Medical Center at 3 p.m. and 5 p.m. for Feldenkrais lessons. Feldenkrais offers a minimal-movement method of reducing tension and increasing comfort while improving posture. All you need is $5 and some free time. Contact Lindley Hunter Silverman at 617-0879, e-mail lindley@mymailstation.com or visit the Feldenkrais Web site at http://www.feldenkrais.com.

If you want maximum relaxation and a soothing end to your Monday, go get your Feldenkrais lesson and then head down to Crowder Hall in the Music building in the Fine Arts Complex to catch Tannis Gibson, assistant professor of piano, playing in the School of Music and Dance Faculty Artist Series. She will play works by Mozart, Berg, Debussy, Kabelevsky and Rachmaninoff. Tickets are $10 for the general public, $8 for UA employees and seniors over the age of 55 and $4 for UA students with a valid ID. For more information, contact the Fine Arts Box Office at 621-1162 or visit the Web site at http://www.arts.arizona.edu.

View a bit of Tucson history and lore, today through Feb.18 at the 2002 Gem, Mineral and Fossil Show at various locations throughout the city. The fortnight of rocks and gems attracts more than 45,000 visitors, with more than 25 separate wholesale and retail gem, jewelry, mineral, fossil and bead shows. For more information, show dates and locations, contact the Metropolitan Tucson Conventions and Visitors Bureau at 624-1817 or visit the Web site at http://visittucson.org.

Find out just how much pollution affects our economy at the ISPE Seminar Series - Air Quality, Climate and Life. Ed de Steiguer, a renewable natural resources and Udall Center for Public Policy fellow, will present "The Socio-Economic Costs of Air Pollution," at the Family and Consumer Resources building, Room 101, from 3:30 p.m. to 4:45 p.m. For more information, contact Sandy Jacobson at 792-8712, e-mail her at saj2@u.arizona.edu or visit the Web site at http://www.ispe.arizona.edu.