The Beginning, The End

Question: I am the beginning of sorrow, and the end of sickness. You can't express happiness without me, yet I'm in the midst of crosses. You may find me in the sun, but never in the evening. What am I?

Question: My thickness is no more than a few centimeters, yet my depth can span to infinity. Although mundane, I intimidate most animals. When in my presence, you will inevitably follow me. What am I?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What asks but never answers?

Question: What has a face and two hands?