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When it comes to how to improve sperm count, remember that if sperm were deeper inside the body, and therefore at body temperature, they would be overactive and burn themselves out. Humans have external testicles to keep sperm cooler and dormant. When they enter another body, they reach the temperature needed to get active. To …

There may be many lifestyle factors affecting sperm count and quality. Among those not discussed are alcohol, nicotine and anabolic steroid use. The problem with correlating sperm data with these factors in a large survey is that an honest admission of the degree of consumption may be difficult to obtain. In addition, stress can have …

In reading about how to solve the black hole paradox, assuming that all of the physical problems of making a measurement within an atom's width of an event horizon were overcome, then how long would it take to make such a measurement, given the time dilation effects of being so close to a supermassive black …

Historical life expectancies reflect infant and child mortalities much more than adult lifespan. In other words, a woman who had lived until menopause at 50 would probably live for 20 more years to the biblical three score and 10. So, while I am not denying the value of grandmothers (let's be clear that we benefited …

"Mysterious you" presents a fascinating argument for the evolution of menopause in women. However, the question remains why evolution has permitted men to continue the possibility of procreation into older age. Perhaps it has done its best to hamper this with a shorter lifespan.

Jen Gunter's comment on the reluctance to market menstrual products using that word is sensible, helpful and represents the world I want to live in. But I am in the US, where half the people believe that anything that appeals to liberals is wrong, unacceptable, literally taking dictation from the devil and to be fought …

In believing that humans will still exist in billions of years, several readers attribute differing degrees of faith in our mental agility to see us through the death of the sun. However, big-brained Homo sapiens has been around for less than a million years, whereas jellyfish have chalked up over 500 million with no brain …

Assuming humans survive into the far future and continue to develop technologically, I reckon we will be able to construct and maintain a system of shields situated at a stable point between Earth and the sun that would reduce solar radiation reaching us and enable an ideal temperature, buying us at least some time before …

Roger Penrose and Stuart Hameroff propose that consciousness arises when a gravitational field causes quantum wave functions in microtubules in our neurons to collapse, so-called orchestrated objective reduction. The gravity on the moon is a sixth of that on Earth. So, if the idea were correct, we would have expected to see consciousness changes in …

The shortcomings of using hydrogen as a fuel that were summarised in your article, relating to efficient and stable storage and transport, can be addressed by using chemicals that combine with the hydrogen, called liquid organic hydrogen carriers. These were successfully trialled during the recent European Union-funded HySTOC project. In addition, the technology relating to …