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At close: April 3 at 5:35:51 PM GMT+2 ...
The color of your poop (stool) can provide clues about diseases or conditions affecting the digestive tract. Some of the causes are harmless, like eating colored foods or taking certain medications, ...
\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.
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