You have "receptors" in your ears for this fundamental force, & they get upset when  you're weightless
[DOC] [TLE] Jeopary Questions page 1068 - STATE THE GOVERNOR ... [PAR] SCIENCE: You have "receptors" in your ears for this fundamental force, & they 
get upset when you're weightless  POTPOURRI: Toronto's coat of arms boasts 
an... [DOC] [TLE] NASA - Human Vestibular System in Space [PAR] Feb 26, 2004 ... Organisms, including humans, must sense accurately before they can react, ... 
We are all familiar with the question, "How many senses do humans have?