Okay. Sit back and eat your popcorn. Lets begin. Lets start off at the latest episode, Episode 20. The device Cisco uses measures TACHYONS. Tachyons? Yes, you remember them from Episode 9 when Harrison Wells stole them from Mercury Labs. Tachyons deal with SPEED. Okay, so Cisco measures tachyons and ends up finding the REAL harrison wells. Lets back track to Episode 17. A few days after eobard thawne TIME TRAVELS, he murders Harrison Wells and buries him. Back to Episode 20. When near the body, Cpt. Lance holds a drink and the liquid begins to float due to the tachyonic particles. Back to Episode 17, in the very beginning as the two speedsters TIME TRAVEL back 15 years ago near the Allen home, the liquid in the drink Nora holds begins to rise/float, as does the young Barry's aquarium water. Now we can state that this liquid flotation is due to speed mainly TIME TRAVEL. Now, all the way back to Episode 1. Right before Barry is struck by lightning, the chemicals in his lab FLOAT. Time travel? Maybe. What if one of the speedsters time traveled to the date of the particle accelerator and did something we have yet to learn. Any thoughts?
In the comics, as Barry dies in the Crisis, he travels back through time and becomes the lightning bolt that enters his lab and gives him his powers.
Maybe that's the way they're going with the series too?