All other things being equal

· long story short

The National Academy of Sciences says we are currently in an ideal period for conducting experiments that test basic causal relationships.
It is very common for a theory to maintain that a certain condition will produce the same effect with absolute consistency, “all other things being equal.” According to the Academy, all other things have been equal for the last several days, and this is expected to hold well into next week–presenting a rare opportunity for scientific researchers worldwide.