Dark matter is a kind of matter in astronomy and cosmology to account for gravitational effects that appear to be the result of invisible mass. Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs... (read more)

CO is poisonous because it blocks the ability of the blood to absorb oxygen. It is called the “silent killer” because it is colorless and has no smell. CO results from the burning of all fossil fuels – not just gas and it is given off most when... (read more)

Starting a new language means learning new words. Of course, many people cite a bad memory for learning new vocal, so they quit before even getting started. But–here’s the key–you absolutely do not need to know all the words of a language to speak... (read more)