Quote: Tomasz Kapitaniak
However, he quickly added, "friction is important."
With a high-friction table, in which the dice can't slide across very easily, the dice tend to bounce around more times, tumbling and twirling, and making the results harder to predict. With a smooth, low-friction, or soft table, the dice tend to bounce fewer times.
Even bouncing doesn't always mix things up. The high-speed video showed that dice frequently did not change their face even after a bounce.