Riddle: I'm found in the sea and on land but I can't walk or swim. I travel by foot but I'm toeless. No matter where I go I'm never far from home. What am I?
Riddle: I'm invisible to the eye. I can never die but without me, you will die. People keep me in jars and boxes but when will they realize that I'm as close as thin air. I'm never easy to be found but sometimes caught lurking around. What am I?