Women are very attracted to a low voice because it's linked to testosterone, which for millions of years was a sign that men had very good spacial skills and would have been very good at hunting and finding their way back home.

TSX-002 will reinforce Aspen's pipeline, further bolstering its presence in a key therapeutic area for the Group. The registration of the product will allow Aspen the opportunity to develop the testosterone market in emerging markets.

Obviously, in the buildup to some fights, there's animosity and testosterone and banter. But at the end of the day, we all understand that this is a business, just two men who are trying to further their careers and provide for their families.

I think my husband and dad were both very happy that I had a baby boy, to get some testosterone in the family, because there are a lot of girls. It's not a perfect family, but it's a strong family. The nice thing is how the different ages interact.

Gays don't have a lot of testosterone. I'm talking about that they use both sides of their brain. Straight men only use one side. Gay men are very bright, very handsome... they put themselves better together. They dress good, they decorate, they clean, they cook.

Restaurant kitchens are highly pressurised environments, with lots of young men, and that means one thing: testosterone. It's not brutal - it's military. It is regimented, tough. People are put into compartments and have to do exactly what they're told or the whole thing falls apart.

I think so many men have this really sharp feeling of being a disappointment in their mid-forties. There's probably something chemical about it - the drop of testosterone, the fact that you don't feel the same way physically. It's a real thing. You do tend to feel like a disappointment.

In the past, rulers led their troops into battle and, even in peacetime, called themselves fathers of their people. And modern politics retains abundant masculine rituals. Prime minister's question time in Britain, for instance, is a stylised duel and tournament redolent of testosterone.

Older fatherhood isn't all bad: testosterone rates drop about 1% per year as men age, making them less reactive and more patient, and a professionally established middle-aged man is likely to have more time and money to devote to his kids than a twenty-something who's just getting started.

For the rest of my life, my testosterone levels will remain underneath women who were born with female anatomy. There's no advantage I could ever get by not taking estrogen. Which I'm not doing, I'm just saying that's a fact, so people should realize that. Which, I don't think most people understand.

The first step to optimising testosterone is eating right. That means cutting out the processed junk food and focusing on high quality proteins, carbs, fats, and an abundance of fruits and vegetables. Don't fall into the 'low fat' eating trap, as this will seriously inhibit your testosterone production.

As a society, we have this perception that women are emotional. The research, however, tells us that, on trading floors, that poor risk rises and falls with testosterone levels, and these trading floors are 85 percent, 90 percent male, and these gentlemen tend, under periods of stress, to show off for each other. That's dangerous.

Gender-dominated environments are not good... particularly in the financial sector where there are too few women. In gender-dominated environments, men have a tendency to... show how hairy chested they are, compared with the man who's sitting next to them. I honestly think that there should never be too much testosterone in one room.

Most of my readers think I'm obsessed with time management, but they haven't seen the other - much more legitimate, much more extreme - obsession. I've recorded almost every workout I've done since age 18. Since 2004, I've been tracking everything from complete lipid panels, insulin, and hemoglobin A1c, to IGF-1 and free testosterone.

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