The first experimental evidence for this was provided by Brown in 1827.
All experimental evidence to date has found these are, indeed, always the same.
A fair amount of experimental evidence seems to support this.
Both of these mechanisms may play a role and have some experimental evidence to support them.
Some experimental evidence has been provided to support these theories.
There is experimental evidence to support all of these theories.
There is a lot of experimental evidence that suggests this to be the case.
There is no independent experimental evidence for any of these particles.
But the experimental evidence indicates that serious damage is possible.
However, there has been no published experimental evidence to support the phenomena.