Our brain controls the production of certain hormones and neurotransmitters such as melatonin, serotonin and dopamine. Simplistically, one can say that “rest and repair” hormones are activated by a...
The sky is blue due to a phenomenon called Raleigh scattering. This scattering refers to the scattering of electromagnetic radiation (of which light is a form) by particles of a much smaller...
If you have clear blood you may be a brachiopod, if you have blue blood you may be an octopus (or just a rich human), but if you have green blood you may have sulfhemoglobinemia.
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