I know you guys like "science":

[fairdeal]

Demonstration showing how a domino can knock over another domino 1.5x its size

[pstephens46]

If you had coated the first in Drano, would it have made a difference?

[dray0151]

Might have eaten to much of the first one away and hence it would only be able to knock one 1.25 it's size down!!!!!!