Albert einstein was a famous, and probably the most well know one.
Informative and Declamation are two types of speech contest
<span>The fact that certain psychological effects appear to shrink over time is called the decline effect.
When something diminishes in power, or shrinks over time (like certain psychological effects in this case), it refers to the decline effect - it means that these is less of something, or it becomes weaker in power.</span>