Hmmmm
Won't it be great if inside everyone of those bricks was a tracer…you would see a large amount in one area…but also see some strays, and also follow the bricks from start to finish.
Hmmmm
Won't it be great if inside everyone of those bricks was a tracer…you would see a large amount in one area…but also see some strays, and also follow the bricks from start to finish.