The engine roars to life and the blades start spinning. Then, all of a sudden, thick white smoke starts billowing out of the ...

Whilst drivers are more likely to notice smoke coming from the exhaust when they start their car in cold weather, the AA warned that white smoke could be a sign that there is a serious fault with ...

And either white or black smoke signals from the Sistine Chapel are used to signify different stages in this super-secret election process. Article continues below But what does each colour of the ...