Now, let me bring up another issue, which is, are we in some way in the grey area? So I say that actually this is female student. I'm a male. How do you know that I'm a male? You can't tell, right? How do I know that you're female? I can't tell. People try to differentiate the two and I think that in the world, we try to be simplistic. We say that, okay, either you're male or you're female. Now I say that actually it's not that case. It is not one and zero. We'd like to see male and female. So at one point, the people will say, wait, how many X chromosomes do you have? Whether you have one X chromosome or two X chromosomes? And later on, people have discovered that the most important part to make a male is because of a Y chromosome. Okay. So if you have a Y chromosome, you are male, but if you have X chromosomes, two X chromosomes, then you are female. But later on, people find that actually it's not just the Y chromosome, because you can have XY individual, actually it's a female. Why is that? Hey, it's because finally they identified there is a gene which is called SRY. Now forget about what it is. This is transcription factor, it's a protein. With that protein, male developed certain structure and female, without that protein, they fail to develop some structure and they become different. So it seems to be binary in that way. But let me ask you, is it really the case? The way that you are who you are is not because you have that gene or you don't have that gene. You know that in our sexual differentiation, that the way that you see me as a standing male here is because of a lot of the hormonal control that in our gonad and how to affect our development of the antibody. So what it is is that, well if I have a more higher level of testosterone, that you're more male. You have lower level of that, you become more female. Alright, and this is what it's showing. So now in the International Olympic Committee, what they do is that they will monitor your level of testosterone. If you have a higher level, you are male. If you have a lower level, you're female. Alright. But okay. So that is still interesting. But are we controlled by one single hormone? No. So let's say given one single hormone, so in general you can see that female goes this way, male go this way. If you are somewhere here, who are you? That's what I want to point out. There's all sort of variation, so what it is that we like to see very binary clear-cut deterministic type of thing. In fact, in the real world, it's not. Because if you look at whatever our sexual characteristic trait, in fact for male, they would follow a normal distribution, including the hormone hormonal level. For female, they follow a normal distribution according to the hormonal level. So what it means is that, if you are somewhere here, it really depends on when you're born, whether they call you Alice or whether they call you Bob. Who are you? And so in a way, in fact it's not just affecting our sexual characteristic, in fact including gender, your sexual orientation. Everything become in the grey area, depends on where your hormonal level is. And in a very critical time point, whether it's more leaning towards the male side or more leaning towards the female side, and in fact you know that for the transsexual individual, they can use the hormonal therapy. They can switch individual. They change their entire character and change their personality and all this. So that means, we can easily be swing from one way to other. So what it mean is that the world is not black and white. It's always in the grey area. Once you understand that, you suddenly become more receptive to everybody's being different. No matter they are male, female, gay, homosexual, transgender. You simply see that actually we are all in the grey area and depends on when you're born, whether you're called Alice or Bob. Then you want to gravitate into one area or the other area. But is it natural? So I'm simply pointing out from the biological standpoint, the natural combination of it tells us that in fact, we should be more receptive to this kind of in-between in the grey area.
