The Director of Public Prosecutions Keir Starmer QC has told ITV Daybreak it is sometimes important to "look again" at Crown Prosecution Service decisions on whether to charge an individual.
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He told People Magazine: "I was in denial, but a part of me always knew this was coming."
A compound within the Conus regius snail's venom has been found to create long-lasting pain relief.
NASA says the phenomenon is "quite unusual to see".