The world's largest flower smells like rotting meat.
Why it is true
The Rafflesia arnoldii emits this foul odor to attract flies and carrion beetles, which are its main pollinators in tropical forests.
Source: Nature
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.