At the same time that the goal should be feasible, it should be capable to be clearly noticed. If it isn’t clearly noticed, it won’t have necessarily a big public impact. Here, we are talking about rejuvenation, and for the public, it doesn’t mean some kind of obscure genetic test; it means look at somebody (and at what somebody do) and say “you are definitely younger than before”. And how to measure that? I just thought of an example: take a former football (soccer) player, like, let’s say, David Beckham, the English guy. If he is 50 years old, he simply can’t play a professional game in the English football league. However, with 35 years old, he can do it. So, a great way to measure the rejuvenation could be taking a group of former football (the most popular sport in the world) players who are 50 years old (obviously “out of the game”), applying the rejuvenation therapies, and putting them to play a professional level football game against a team of the English league, or other important football league. IF SOME BUNCH OF GUYS 50 YEARS OLD ARE ABLE TO PLAY COMPETITIVELY AGAINST A PROFESSIONAL TEAM OF THE ENGLISH OR OTHER IMPORTANT LEAGUE, EVERYBODY WILL KNOW THEY REJUVENATED, WITHOUT ANY OTHER TEST. AND THE WORLD WILL CHANGE!