darkspilver: It's no secret, in fact the GB proudly highlight the changes they've made... Listed in the Index under the heading 'Beliefs Clarified'
FAKE
There seems to be an issue here with the use of 'changes' / 'clarification'
The OP originally asked about changes
darkspilver linked to the WT Online Index, and pasted a summary of clarifications
Clarifications are NOT changes and should NOT be confused.
Sorry about that - I should have re-worded my original reply to emphasize 'clarifications' rather than 'changes' in order to avoid the confusion - thanks to careful for picking this up!
For example
2000: use of one’s own blood: w00 10/15 30-31
This was a clarification in view of medical advances - such as the introduction of the 'cell-saver' machine:
Watchtower, October 15, 2000
Questions From Readers: In the light of Bible commands about the proper use of blood, how do Jehovah’s Witnesses view medical procedures using one’s own blood?
Blood that flows into a wound may be captured and filtered so that the red cells can be returned to the patient; this is called cell salvage. In a different process, blood may be directed to a machine that temporarily carries on a function normally handled by body organs (for example, the heart, lungs, or kidneys). The blood from the machine is then returned to the patient. In other procedures, blood is diverted to a separator (centrifuge) so that damaging or defective portions of it can be eliminated. Or the goal may be to isolate some of a blood component and apply that elsewhere on the body. There are also tests in which a quantity of blood is withdrawn in order to tag it or to mix it with medicine, whereupon it is put back into the patient.
The details may vary, and new procedures, treatments, and tests will certainly be developed. It is not our place to analyze each variation and render a decision. A Christian must decide for himself how his own blood will be handled in the course of a surgical procedure, medical test, or current therapy.
This, in principle, is no different from the following from 1978 - and hence, in the example, this is NOT a change, but a clarification.
Watchtower June 15, 1978
Questions From Readers: What about a device such as a heart-lung pump or a dialysis (artificial kidney) machine? Might a Christian use such?
There are Christian witnesses of Jehovah who, with a good conscience, have allowed these devices to be used, provided that the machines were primed with a nonblood fluid, such as Ringer’s lactate solution.
When this sort of device is operating, the patient’s blood flows from a blood vessel through tubing and the machine (where it is pumped, oxygenated and/or filtered) and then flows back into his circulatory system. The machine temporarily performs some of the functions normally handled by the patient’s own organs.
Some Christians have conscientiously reasoned that the blood is flowing continuously and that the external circuit might be viewed as an extension of the circulatory system. They have considered it comparable to a piece of tubing that might be implanted in the body to shunt blood around a blockage in a vessel.
Of course, each Christian should weigh what is involved in the use of these and similar devices. He could consider whether he views the blood involved to be blood that clearly has left his body and so should be disposed of or as blood that, basically, is still part of his circulatory system. (Deut. 12:16) Then he can make a decision that will leave him with a clear conscience before God.—1 Pet. 3:16.
MacHislopp: The change, very carefully worded is clear! “Each Christian decides for himself how his own blood will be handled..”
Isn't that really just a slightly shorter way to express the same principle as contained in the last paragraph I quoted above from the 1978 Watchtower?