QUESTIONS

Q :

Why is oil traded exclusively in U.S. dollars instead of the currency of the country buying or selling it? T. Bailey, Nottingham.

Q :

We wrongly say the sun goes up and down. What other scientifically incorrect expressions do we use? Michael Dean, Hayle, Cornwall.

Q :

Is the word arch, meaning being playful or mischievous, related to the architectural feature? Mrs N. Jones, Cardiff.