Is there an adjective that describes the nature of expiring, connoting a sense of losing public attention, in a very short amount of time? For example,
In a fast-paced era, news articles are ____.
During the 1990s, compared with traditional technologies, computer technologies are ___; for example, a new generation of CPU technologies usually comes out every one to two years.
(I thought about "perishable," but it does not seem connoting "losing public attention.")