Standard Postcard-a standard postcard mails First Class at current rate of 35Â¢. The smallest maiLabel size for ANY postcard is 3Â½â³ x 5.â³. The largest postcard size for mailing at the 35Â¢ rate is 4Â¼â³ x 6.â³. The paper thickness must be at least 0.007 â³ and not more than 0.016 â³ in thickness.
1 Prohibits head first diving in water depths less than 8 feet. 2  Restricts use of starting blocks to competitive swimmers or swimmer training activities.  Requires new installation (effective October 7, 1992) of starting blocks to be in the deep end in at least 6 feet of water.
1. Practice holding your breath for long periods of time when you're out of the water. Most swimmers need to hold their breath for about 20 to 30 seconds per 100 feet of underwater swimming. 2. Swim long distances underwater only if you're being watched by a friend or you're at a pool with a lifeguard. 3. Breathe in deeply, pushing the air down through your diaphragm and into your lungs.