Question: I can run but never walk. Wherever I go, thought are close behind me.

What am I?

Question: What's black and white and red all over?

Question: Give me food, and I will live. Give me water, and I will die. What am I?

Question: You use a knife to slice my head and weep beside me when I am dead.

What am I?

Question: I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter.

What am I?