Every day, a coral grows a new band of limestone on its skeleton. Its  rate of growth is affected by the seasons, the moon and the tides. 
The first motorcycle was designed and built by the firm of  Michaux-Perreaux in France in 1869. It ran on steam. The first  petrol-driven motorcycle was designed in 1885 by Gottlieb Daimler. Its  top speed was 19 kmph (12 mph). Compare this with the 512 kmph (318.6  mph) of the fastest modern bike.
The pink colouring of flamingos depends on the food they eat. In the  wild, they filter shrimps and algae from water. In captivity, they are  often fed on carrot juice to prevent their feathers fading ot dull grey.
A nova (meaning "new star") is a star that suddenly flares up to be many  times brighter than it is. A really brilliant nova may have been a star  which could hardly be seen even with a large telescope. As a nova it  becomes visible to the naked eye, but gradually fades again.






