Last year was a banner year for tornadoes, with a deadly spate of twisters leveling homes and businesses throughout the midwest and south in the early part of the year. And, of course, the city of Joplin, Missouri. Fletcher recounted the damage to his hometown in our January issue, in which he also ponders whether global warming may have contributed to that tornado's incredible power. Check it out for a thorough description of how tornadoes form, and how a warming atmosphere may be making them worse. Meanwhile, fellow midwesterners, heed those tornado sirens.