Is there a simple, readable way to join two hashes? I'd like to take %my_hash and %my_second_hash and combine them into %my_third_hash, which contains all keys and values from the first two hashes. Alternatively, I'd like to be able to add the key/value pairs from %my_second_hash to %my_hash. I don't really care what happens to duplicate keys as long as I know what will happen.