Test # 56
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760 questions in 76 tests. Each test contains 10 questions.
Idiom of the Day
hitch one`s wagon to a star
to aim high, to follow a great ambition or purpose
The man wants to hitch his wagon to a star and pursue his dreams of becoming an actor.
Cure for Fever
Tips to get ready for Valentines day
Amazing Science Images You Must See
Are We In Outer Space
The space between cells is a freeway when youre a Staphylococcus bacterium. A tight barrier of cells is supposed to prevent outside invaders like these Staph bugs (red and purple) from entering the body. The fact that we get sick is testimony that those barriers sometimes fail. Now, University of Pennsylvania researchers have found one reason why: Some pathogenic bugs have the key that opens secret passages in this cellular wall.