Further confirmation of special relativity comes in this item at phy.org. A good way of introducing the topic.
"A team of researchers working at the Experimental Storage Ring in Damstadt, Germany have conducted an experiment using ions pushed to 40 percent of the speed of light to verify time dilation to a new level of precision. In their paper published in Physical Review Letters, the team describes how their experiment was conducted and how it allowed them to validate the time dilation prediction to just a few parts per billion."
See also this article at Wikipedia.