There are always new oddities to be discovered in Science. Researchers have now identified a second set of twins (this time before birth) who are neither identical nor fraternal (https://www.theguardian.com/science/2019/feb/27/scientists-stunned-discovery-semi-identical-twins). The boy and girl who shared a placenta, are sesquizygotic, as established by genetic studies of their embryological membranes, being the result of 2 sperm fertilising a single egg. The surviving products of the fertilisation essentially receive identical maternal but different paternal genes.
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