Speed of light not so constant after all

Even in vacuum conditions, light can move slower than its maximum speed depending on the structure of its pulses.

Can someone really prove why speed of light is same for all

What If The Speed of Light is NOT CONSTANT?

proof that Kizarus light does not have a constant speed and can

15000 links/liens by GLOBOCOM - Issuu

Advanced Stellar Propulsion Systems

There's no way to Measure the Speed of Light in a Single Direction

Questioning the Speed of Light

MindField

Does Everything Move at the Speed of Light?

special relativity - How is the speed of light constant in all

Time dilation - Wikipedia

How does the speed of light change? - Quora