1) The word "school" contains two vowels: O and O.

2) The largest insurance market in the world is Lloyd's of London, which is not an insurance company but a market where insurance brokers and underwriters come together.

3) The sunflower is not a single flower but a cluster of small flowers arranged in a spiral pattern.

4) The naming of cyclones varies depending on the region. For example, cyclones in the Atlantic and eastern Pacific Ocean are named using a predetermined list of names.