Riddles

[James]

Hi! I, like other people, am a big fan of riddles, so I thought I'd post a few here. Post your answers!

1: While walking across a bridge I saw a boat full of people. Yet on the boat there wasn't a single person. Why?

2: The names of three trees are hidden in the sentences below. The letters are in consecutive order. Can you find them? On this farm, we get ham from a hog any time. The farmer will help in every possible way. He faced two very similar choices, both bad.

3: Two babies were born to the same person, in the same minute, in the same hour, in the same year, yet they are not twins. How is this possible?

4: Forward I am heavy, but backward I am not. What am I?

Post your answers, quote the question number. Good luck"