decay

One memory decayed much faster than the other -- a form of memory loss necessary for habituation, the researchers noted.

But if it has been used inappropriately or installed poorly, it might put stress on timbers, restrict air circulation and put them at risk of decaying.

Fluoride - a naturally occurring mineral recognised to protect teeth against decay - is added to water supplies in many countries, including the US, where around 63% of the population have fluoridated water.

But the dinosaur, encased in layers of sediment, is exempt from this endless cycle of growth and decay.

It means there are now 599 sites across the capital deemed at risk of neglect, decay or inappropriate development by the heritage group.