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True. A span of thirty seconds is considered a short time for the existence of a superheavy element. These elements have very unstable nuclei that decay quickly.
Time is the only proof.
short-span memory
A single sitting
To cover large amounts of ground in a short span of time.
They can only fly for a short span of time when the're young.
The New Testament
A short attention span refers to the inability to focus or concentrate on a task for an extended period of time. It may result in easily getting distracted, having difficulty completing tasks, or frequently switching from one task to another.
Probably it is dung that is a fossil
Titus was only emperor for two years. He had no time to have either success or failure in that short span.
Index Fossils