The good part about all the horror stories brought back from traveling is that there's usually a lesson to be learned. (Don't overpack your luggage with the creaky zipper. Do assume that Vaseline will be considered a potentially dangerous liquid.) This month's Of Recent Note, as summer vacations take form and volcanic ash gets in everyone's way, is: Travel Tips You Learned the Hard Way. So share your advice gleaned from security lines, random searches, overbooked flights, gate-rushing, the unglamorous magic of train travel, gas stations or hotel rooms straight out of an urban legend, and any other experiences that left you battle-scarred but with wisdom to share. Send entries (about 150 words each) to [email protected] by Tuesday, April 27.