#10 "Was your nose bleeding like that when you went under?" Christina Booth of Brooklyn, N.Y.

Use these eight tips to take the chill out of every dive.

Know for sure, know it fast. Here's how to tell. Other questions covered: Fire coral burn: Long-term effects? Keeping kids warm in cold water, Can a fracture preclude diving? Can I dive with DVT? Can an unnecessary chamber treatment be harmful?

Lots of batteries mean lots of light. But we tell you which lights make best use of all the power.

A complete guide to diving Europe's Caribbean.

Your dive buddy just ran out of air and he's coming for you. Is your octopus reg up to the job?

Once bordering on extinction, California's black sea bass are staging a big comeback.

More v. Bigger. In general, look for more batteries (six or eight) if you want a brighter light; look for bigger batteries (C or D cells) if you want longer burn time. You can find more light buying tips in Night Skills, our feature devoted to ...

Avoid task loading. Remember the K.I.S.S. principle, because stupid is what you'll be. If you've got a new and confusing camera housing, get familiar with it at shallow depths. And it's not just the picture you might screw up at ...