A meeting at Cern, the world's largest physics lab, has addressed results that suggest subatomic particles have gone faster than the speed of light.
The team has published its work so other scientists can determine if the approach contains any mistakes.
If it does not, one of the pillars of modern science may come tumbling down.
Antonio Ereditato added "words of caution" to his Cern presentation because of the "potentially great impact on physics" of the result.
The speed of light is widely held to be the Universe's ultimate speed limit, and much of modern physics - as laid out in part by Albert Einstein in his theory of special relativity - depends on the idea that nothing can exceed it.
more BBC News - Speed-of-light results under scrutiny at Cern
The team has published its work so other scientists can determine if the approach contains any mistakes.
If it does not, one of the pillars of modern science may come tumbling down.
Antonio Ereditato added "words of caution" to his Cern presentation because of the "potentially great impact on physics" of the result.
The speed of light is widely held to be the Universe's ultimate speed limit, and much of modern physics - as laid out in part by Albert Einstein in his theory of special relativity - depends on the idea that nothing can exceed it.
more BBC News - Speed-of-light results under scrutiny at Cern