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The accepted range for the wavelengths of light that the human eye can detect is roughly between 400nm and 700nm. Is it a co-incidence that these wavelengths are identical to those in the Photosynth …

Humans do not produce Vitamin C due to a mutation in the GULO (gulonolactone oxidase) gene, which results in the inability to synthesize the protein. Normal GULO is an enzyme that catalyses the react …

Salt water may have anti-septic properties due to the effect it has on water potential. Pure water has a water potential (Ψ) of zero. A concentrated salt solution has a lower (more-negative) water p …

All humans can be grouped into ABO and Rh+/- blood groups (at a minimum). Is there any advantage at all to one group or the other? This article hints that there are some pathogens that display a pre …

This information is all strictly for Entonox - a brand of analgesic gas comprising 50% Oxygen (O2) and 50% Nitrous Oxide (N2O), Laughing Gas. This mixture is known as 'Gas and Air' and is in very com …

I've been doing a little more digging myself and have found a couple of other advantages: Risk of Venous-thromboembolism (deep vein thrombosis/pulmonary embolism (1)). Blood group O individuals are …

Hypothermia (when the body is too cold) is said to occur when the core body temperature of an individual has dropped below 35° celsius. Normal core body temperature is 37°C. (1) Hypothermia is then f …

I'm rather ashamed to say that this question is partly based on an episode of House. I have previously heard that, if there are multiple simultaneous painful stimuli, the mind will only feel the sens …

The red colour of blood isn't actually to do with food at all. The primary purpose of the blood is to carry oxygen to all the cells that require it to release energy. Red Blood Cells are filled with …

The standard protocol for a person experiencing chest pains is to chew a 300mg aspirin tablet, the argument being that chewing rather than swallowing the tablet results in the aspirin entering the blo …

I'm sure that everyone is familiar with the sensation commonly known as "butterflies in the stomach". It is commonly experienced during periods of anxiety or stress (e.g. before high stakes job inter …

I understand that in normal REM sleep the voluntary muscles are in effect paralysed in order to prevent an individual acting out their dreams. This paper indicates that there are likley to be multipl …

In the graph above the darker blue line refers to the antibodies the baby receives from the mother in utero, as you mentioned in your question. As you can see, the red line indicates that babies …

Overview Laser eye surgery works by altering the shape of the cornea. The cornea works together with the lens to focus rays of light onto the retina. The cornea accounts for two-thirds of the op …

I'll point you to this article by A. Tuiten et al. To quickly answer your question, yes, testosterone does have an enhancing effect on the sexual behaviour of human healthy adult females. The (admi …